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Frogs and toads are usually poisonous.A．YB．NC．NG
Frogs and toads are usually poisonous.
A．Y
B．N
C．NG
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题目内容
（请给出正确答案）
Frogs and toads are usually poisonous.
A．Y
B．N
C．NG
答案
更多“Frogs and toads are usually poisonous.A．YB．NC．NG”相关的问题
第1题
Kelber believes that nocturnal frogs and toads ______.
A．belong to higher animals
B．use color to attract mates
C．are of many different colors
D．are unable to see color at night
第2题
A．the clouds over the forest of neighboring Nicaragua
B．computer simulations of day
C．the gradual shifting of bird living upslope
D．a recent population decrease of frogs and toads
第3题
听力原文： I want to talk today about some studies. They seem to indicate that there is a startling world-wide decline in the number of amphibians, such as frogs, toads and salamanders. There's little doubt that one reason why the number of amphibians is declining is their habitats have been destroyed when the developers fill in ponds and marshes to build houses. Amphibians can't just move somewhere. They need water to lay their eggs in. Another problem is the growing fish industry. Another range of popular pool fish such as carp have been introduced to many lakes and ponds all over the world. Raising and selling these fish can be profitable, but the fish eat the eggs and offspring of amphibians that were already living in the lakes and ponds. Other factors could be contributing to the decline include acid rain and the spread of pesticide residues. Many pesticides that farmers added to their crops are eventually washed away by the rain and end up in ponds and other bodies of water where amphibians live. Amphibians are especially vulnerable to pesticides dissolved in the water because of their moist skins. Water can pass through amphibians allowing toxins dissolved in the water to enter the amphibians' body.
What does the speaker mainly discuss？
A．The distribution of different species of amphibians.
B．Possible reasons for reduction in the number of amphibians.
C．The effects of environmental change on the fish industry.
D．Guidelines for the responsible use of pesticides.
第4题
The so-called cloud forests of Monteverde lie along the crest of Costa Rica's Cordillera de Tilaran mountains. These habitats rely on the almost perpetual fog that forms as moisture-laden Caribbean winds rise up the eastern slopes of the mountains and pass through altitudes at which clouds condense, says Robert O. Lawton, an ecologist at the University of Alabama in Huntsville. The humidity in those breezes is enhanced by moisture expelled from the leaves of lowland forests.
By the early 1990s, more than a century of deforestation had left only 18% of the Costa Rican lowland forests east of the peaks untouched. The pastures that replaced forests don't humidify the winds as well as forests do and are better at warming the atmosphere. As a result, the winds off these pastures must rise further up the Cordillera de Tilaran slopes before clouds condense.
Satellite photos of the lowlands in the dry season show that clouds are absent or sparse over deforested areas but are thicker over the forests of neighboring Nicaragua. Computer simulations of day-time cloud formation in the area support these observations, Lawton notes, and they also suggest that the altitude of the cloud base would rise about 200m above today's height if the lowlands were completely deforested. Lawton and his colleagues report their result in Science magazine.
The gradual shifting of bird ranges upslope and a recent population crash among frogs and toads in the Monteverde cloud forest suggest that the veil of clouds may be lifting. Scientists had already blamed the rise of the cloud base for the longer periods of mistfree conditions observed at the downwind edge of the forest. Lawton warns that in the future, the clouds may disappear from the Monteverde slopes for days at a time during the dry season -- a development that could lead to collapse of the ecosystems there.
The passage mainly discusses ______.
A．large-scale deforestation and the climate changes
B．ecosystems in the eastern lowlands
C．the cloud forests of Monterverde
D．Caribbean winds
第5题
What was the serious problem after the cane toads arrival in Australia？
A．The cane toads did not eat the cane beetles.
B．The number of the cane toads had swollen.
C．There was another outbreak of the cane beetles.
D．The cane toads killed all the cane beetles.
第6题
根据以下材料，回答题
Toads Are Arthritis and in Pain
Arthritis is an illness that can cause pain and swelling in your bones. Toads， a big problem in the north of Australia， are suffering from painful arthritis in their legs and backbone， a new study has shown.
The toads that jump the fastest are more likely to be larger and to have longer legs.__________ （46）
The large yellow toads， native to South and Central America， were introduced into the north-eastern Australian state of Queensland in 1935 in an attempt to stop beetles and other insects from destroying sugarcane crops. Now up to 200 million of the poisonous toads exist in the country，and they are rapidly spreading through the state of Northern Territory at a rate of up to 60 km a year.
The toads can now be found across more than one million square kilometers. __________ （47） A Venezuelan poison virus was tried in the 1990s but had to be abandoned after it was found to also kill native frog species.
The toads have severely affected ecosystems in Australia. Animals， and sometimes pets， that eat the toads die immediately from their poison， and the toads themselves eat anything they can fit inside their mouth. __________ （48）
A co-author of the new study， Rick Shine， a professor at the University of Sydney， says that little attention has been given to the problems that toads face. Rick and his colleagues studied nearly 500 toads from Queensland and the Northern Territory and found that those in the latter state were very different. They were active， sprinting down roads and breeding quickly.
According to the results of the study， the fastest toads travel nearly one kilometer a night.__________（49） But speed and strength come at a price——arthritis of the legs and backbone due to constant pressure placed on them.
In laboratory tests， the researchers found that after about 15 minutes of hopping， arthritic toads would travel less distance with each hop （跳跃） . __________ （50） These toads are so programmed to move， apparently， that even when in pain the toads travelled as fast and as far as the healthy ones， continuing their relentless march across the landscape.
回答（46）题 查看材料
A.But this advantage also has a big drawback——up to 10% of the biggest toads suffer from arthritis.
B.The task now facing the country is how to remove the toads.
C.But arthritis didn"t slow down toads outside the laboratory.
D.Toads with longer legs move faster and travel longer distances while the others are being left behind.
E.Toads are not built to be road runners——they are built to sit around ponds and wet areas.
F.Furthermore， they soon take over the natural habitats of Australia"s native species.
第7题
A．has
B．have been
C．had been
D．is
第8题
Toads are Arthritis and in Pain
Arthritis c关节炎) is an illness thatcan cause pain and swelling in your bones. Toads (蟾蜍),a big problem inthe north of Australia, are suffering from painful arthritis in their legs andbackbone, a new study has shown. The toads that jump the fastest are morelikely to be larger and to have longer legs. (46)
The large yellow toads,native to South and Central America, were introduced into the north-easternAustralian state of Queenslandin 1935 in an attempt to stop beetles and other insects from de-stroyingsugarcane crops. Now up t0 200 million of the poisonous toads exist in thecountry, and they are rapidly spreading through the state of Northern Territory at a rate of up t0 60 kma year. The toads can now be found across more than one million squarekilometers. (47) A Venezuelanpoison virus was tried tin the 1990s but had to be abandoned after it was foundto also kill native frog species.
The toads have severelyaffected ecosystems inAustralia.Animals, and sometimes pets, that eat the toads die immediately from theirpoison, and the toads themselves eat anything they can fit inside their mouth._ (48)
A co-author of the newstudy, Rick Shine, a professor at the University of Sydney,says that lit-tle attention has been given to the problems that toads face.Rick and his colleagues studied nearly 500 toads from Queenslandand the Northern Territoryand found that those in the latter state were very different. They were active,sprinting down roads and breeding quickly.
According to the results ofthe study, the fastest toads travel nearly one kilometer a night. (49) But speed and strength come at aprice-arthritis of the legs and backbone due to con-stant pressure placed onthem.
Inlaboratory tests, the researchers found that after about 15 minutes of hopping,arthritic toads would travel less distance with each hop (跳跃). _ (50) These toads are so programmedto move~ apparently, that even when in pain the toads travelled as fast and asfar as the healthy ones, continuing their constant march across the landscape.
46
47
48
49
50
请帮忙给出每个问题的正确答案和分析，谢谢！
第9题
Why did the sugar cane farmers bring cane toads to Australia？
A．To enrich the variety of species.
B．To deal with cane beetles.
C．To balance the＞eco-system.
D．To strengthen the food chain.
第10题
A downpour of frogs occurred near______.
A．Appin, Scotland
B．Vienna
C．Hamburg
D．Liverpool
