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their numbers
A.fast
B.typically
C.firmly
D.jointly
答案
更多“leaving insects unable to reproduce_____enough to keep up”相关的问题
第1题
Where Have All the Bees Goner
Scientists who study insects have a real mystery on their hands. All across the country, honeybees are leaving their hives (蜂巢) and never returning. Researchers call this phenomenon colony-collapse (群体瘫痪) disorder. It is reported that 25 to 40 percent of the honeybees in the US have vanished from their hives since last fall. So far, no one can explain why.
Colony collapse is a serious concern' because bees play an important role in' the production of about one-third of the foods we eat. As they feed, honeybees spread pollen (花粉) from flower to flower. Without this process, a plant can't produce seeds or fruits.
Now, a group of scientists and beekeepers have teamed up to try to figure out what's causing the alarming collapse of so many colonies. They hope to find out what's contributing to the decline and to prevent bee disappearance in the future.
It could be that disease is causing the disappearance of the bees. To explore that possibility, Jay Evans, a researcher at the United States Department of Agriculture (USDA) Bee Research Laboratory, examines bees taken from colonies that are collapsing. "We know what a healthy bee should look like on the inside, and we can look for physical signs of disease," he says. And bees from collapsing colonies don't look very healthy. "Their stomachs are worn down, compared to the stomachs of healthy bees," Evans says. It may be that a parasite (寄生虫) is damaging the bees' digestive organs. Their immune (免疫的) systems may not be working as they should. Moreover, they have high levels of bacteria inside their bodies.
Another cause of colony-collapse disorder may be certain chemicals that farmers apply to kill unwanted insects on crops, says Jerry Hayes, chief bee inspector for the Florida Department of Agriculture. Some studies, he says, suggest that a certain type of insecticide (杀虫剂) affects the honeybee's nervous system and memory. "It seems like honeybees are going out and getting confused about where to go and what to do," he says.
If it turns out that a disease is contributing to colony collapse, bees' genes could explain why some colonies have collapsed and others have not. In any group of bees there are many different kinds of genes. The more different genes a group has, the higher the group's genetic diversity. So far scientists haven't determined the role of genetic diversity in colony collapse, but it's a promising theory, says Evans.
What is the mystery that researchers find hard to explain？
A．Honeybees are flying all across the country.
B．Half of the honeybees in the US have died.
C．Honeybees are leaving their hives and do not return.
D．Honeybee hives are in disorder.
第2题
Where Have All the Bees Gone？
Scientists who study insects have a real mystery on their hands．A11 across the country，honeybees are leaving their hives and never returning. Researcher call this phenomenon colony—collapse1 disorder．According to surveys of beekeepers across the country，25 to 4o percent of the honeybees in the United States have vanished from their hives since last fall .So far，no one can explain why．
Colony collapse is a serious concern because bees play an important 11ole in the production of about one—third of the foods we eat．As they feed，honeybees spread pollen from flower to flower．Without this process，a plant can’t produce seeds or fruits．
NOW，a group of scientists and beekeepers have teamed up to try to figure out what’s causing the alarming collapse of so many colonies． By sharing their expertise in honeybee behavior，health， and nutrition，team members hope to and out what’s contributing to the decline and to prevent bee disappearances in the future．
It could be that disease is causing the disappearance of the bees．To explore that possibility，Jay Evans，a researcher at the United States Department of Agriculture（USDA）Bee Research Laboratory2，examines bees taken from colonies that are collapsing． “We know what s healthy bee should look like on the inside，and we can look for physical signs of disease，”he says．And bees from collapsing
colonies don’t look very healthy． “Their stomachs arc：worn down，compared to the stomachs of healthy bees，”Evan8 says．It may be that a parasite is damaging the bees’ digestive organs．Their immune systems may not be working as they should．Moreover，they have high levels of bacteria inside their bodies．
Another cause of colony—collapse disorder may be certain chemicals that farmers apply to kill unwanted insects on crops，says Jerry Hayes，chief bee inspector for the Florida Department of Agricuhure3．Some studies，he says，suggest that a certain type of insecticide affects the honeybee’s
nervous system（which includes the brain）and memory．“It seems like honeybees are going out and getting confused about where to go and what to do，”he says.
If it turns out that a disease is contributing to colony collapse，bees’ genes could explain why some colonies have collapsed and others have not．In any group of bees there are many different kinds of genes．The more different genes a group has，the higher the group’s genetic diversity.So far scientists haven，t determined the role of genetic diversity in colony collapse，but it’s a promising theory，says Evans．
第 36 题 What is the mystery that researchers find hard to explain？
A．Honeybees are flying all across the country.
B．25-40 percent of the honeybees in the US have died.
C．Honeybees are leaving their hives and do not return.
D．Honeybee hives are in disorder．
第3题
Where Have All the Bees Gone？
Scientists who study insects have a real mystery on their hands. All across the country, honeybees are leaving their hives and never returning. Researchers call this phenomenon colony-collapse (瓦解) disorder. According to surveys of beekeepers (养蜂人) across the country, 25 to 40 percent of the honeybees in the United States have vanished from their hives (麻疹) since last fall. So far, no one can explain why.
Colony collapse is a serious concern because bees play an important role in the production of about one-third of the foods we eat. As they feed, honeybees spread pollen from flower to flower. Without this process, a plant can't produce seeds or fruits. Now, a group of scientists and beekeepers have teamed up to try to figure out what's causing the alarming collapse of so many colonies. By sharing their expertise (专家的意见) in honeybee behavior, health, and nutrition, team members hope to find out what's contributing to the decline and to prevent bee disappearances in the future.
It could be that disease is causing the disappearance of the bees. To explore that possibility, Jay Evans, a researcher at the United States Department of Agriculture (USDA) Bee Research Laboratory, examines bees taken from colonies that are collapsing. "We know what s healthy bee should look like on the inside, and we can look for physical signs of disease," he says. And bees from collapsing colonies don't look very healthy. "Their stomachs are worn down, compared to the stomachs of healthy bees," Evans says. It may be that a parasite is damaging the bees' digestive organs. Their immune systems may not be working as they should. Moreover, they have high levels of bacteria inside their bodies.
Another cause of colony-collapse disorder may be certain chemicals that farmers apply to kill unwanted insects on crops, says Jerry Hayes, chief bee inspector for the Florida Department of Agriculture. Some studies, he says, suggest that a certain type of insecticide affects the honeybee's nervous system (which includes the brain) and memory. "It seems like honeybees are going out and getting confused about where to go and what to do," he says.
If it turns out that a disease is contributing to colony collapse, bees' genes could explain why some colonies have collapsed and others have not. In any group of bees there are many different kinds of genes. The more different genes a group has, the higher the group's genetic diversity. So far scientists haven't determined the role of genetic diversity (差异) in colony collapse, but it's a promising theory, says Evans.
What is the mystery that researchers find hard to explain？
A．Honeybees are flying all across the country.
B．25--40 percent of the honeybees in the US have died.
C．Honeybees are leaving their hives and do not return.
D．Honeybee hives are in disorder.
第4题
What's the policeman's biggest headache？ ______.
A．He has to justify his arrests while unable to provide sufficient evidence in most cases.
B．He has to provide the best possible public service at the least possible expense.
C．He has to get the most desirable results without breaking the law in any way.
D．He can hardly find enough time to learn criminal law while burdened with numerous criminal cases.
第5题
An environment favorable to the growth and later preservation of organisms is required for the occurrence of fossils. Two conditions are almost always present: The possession of hard parts, either internal or external, such as bones, teeth, scales, shells, and wood; these parts remain after the rest of the organism has decayed. Organisms that lack hard parts, such as worms and jelly fish have left a meager geologic record. Quick burial of the dead organism, so that protection is afforded against weathering, bacterial action, and scavengers.
Nature provides many situations in which the remains of animals and plants are protected against destruction. Of these, marine sediment is by far the most important environment for the preservation of fossils, owing to the incredible richness of marine life. The beds of former lakes are also prolific sources of fossils. The rapidly accumulating sediments in the channels, floodplains, and deltas of streams bury fresh-water organisms, along with land plants and animals that fall into the water. The beautifully preserved fossil fish from the Green River soil shale of Wyoming in the western Unit- ed States lived in a vast shallow lake.
The frigid ground in the far north acts as a remarkable preservative for animal fossils. The woolly mammoth, a long-haired rhinoceros and other mammals have been periodically exposed in the tundra of Siberia, the hair and red flesh still frozen in cold storage.
Volcanoes often provide environments favorable to fossil preservation. Extensive falls of volcanic ash and coarser particles overwhelm and bury all forms of life, from flying insects to great trees. Caves have preserved the bones of many animals that died in them and were subsequently buried under a blanket of clay or a cover of dripstone. Predatory animals and early humans alike sought shelter in caves and brought food with them to the eater, leaving bones that paleontologists have discovered.
The passage primarily concerns which of the following？
A．Types of fossils found in different climates.
B．Some physical character of fossils.
C．Conditions favorable to the preservation of fossils.
D．How fossils are preserved.
第6题
Where Have All the Bees Gone？
Scientists who study insects have a teal mystery on their hands． All across the country，honeybees are 1eaving their hives and never returning． Researchers call this phenomenon colony—collapse disorder． According to surveys of heekeepers across the country，25 to 40 percent 0f the honeybees in the United Stales have vanished from their hives since last fall． so far，no one call explain why．
Colony collapse is a serious concern because bees play an important role in the production of about one-third of the foods we eat． As they feed， honeybees spread p011en from flower to flower．Without this process，a plant can’t produce seeds or fruits．
Now，a group of scientists and beekeepers have teamed up to try to figure out what’s causing the alarming collapse of so many colonies． By sharing their expertise in honeybee behavior， health， and nutrition．team members hope to find out what’s contributing to the decline and to prevent bee disappearances in the future．
It could be that disease is causing the disappearance of the bees． To explore that possibility，Jay Evans．a researcher at the Unite States Department of Agriculture（USDA）Bee Research Laboratory2，examines bees taken from colonies that are collapsing．“We know what s healthy bee should look like on the inside，and we can look for physical signs of disease，”he says．And bees from collapsing’
colonies don’t look very healthy．“Their stomachs are worn down．，compared．to the stomachs 0f healthy bees，” Evans says．It may be that a parasite is damaging the bees’ digestive organs．Their immune systems may not be working：as they should．Moreover，they have high levels of bacteria inside their bodies．
Another cause of colony—collapse disorder may be certain chemicals that farmers apply to kill unwanted．insects on crops，says Jerry Hayes，chief bee inspector for the Florida，Department of Agriculture ．Some studies，he says，suggest that a certain type of insecticide affects the honeybee’ s nervous system（which includes the brain）and memory．“It seems like honeybees are going out and getting confused about where to go and what to do，”he says．
If it turns out that a disease is contributing to colony collapse，bees’ genes could explain why some colonies have collapsed and others have not．In any group of bees there are many different kinds of genes．The more different genes a group has．the higher the group’s genetic diversity．So far scientists haven’t determined the role of genetic diversity in colony collapse，but it’s a promising theory，says Evans．
第 31 题 What is the mystery that researchers find hard to explain？
A．Honeybees are bying all across the country．
B．25—40 percent of the honeybees in the US have died．
C．Honeybees are leaving their hives and do not return．
D．Honeybee hives are in disorder．
第9题
In Line 6 Para. 2, "this" refers to ______ .
A．the expatriates came to collect insects in the rainforest neighborhood
B．the government developed a pioneering project
C．the expatriates involved in commercial exploitation of the insects
D．the expatriates made profit from commercial exploitation with the aid of rainforest habitats
第10题
All bears eat similarly insects, fruits, nuts, and small animals.
A．Y
B．N
C．NG
