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Why did the natural pearl trade collapse in the 1930s？
A. Because of competition from cheaper Japanese pearl-fishing.
B. Because of competition from oil industry.
C. Because of competition from cheaper Japanese cultured pearls.
D. Because of pollution from oil industry.
答案
更多“Why did the natural pearl trade collapse in the 1930s？A. Because of competition from cheap”相关的问题
第1题
Why did the natural pearl trade collapse in the 1930s？
A．Because of competition from cheaper Japanese pearl-fishing.
B．Because of competition from oil industry.
C．Because of competition from cheaper Japanese cultured pearls.
D．Because of pollution from oil industry.
第2题
Why did the resistance of insects to man-made insecticides develop so rapidly？
A．Insects can develop ways of dealing with man-made insecticides as they do with natural poisonous chemicals.
B．Insects can be smarter than they used to be.
C．Insects can attract their mates to the same plant.
D．Insects will be attracted to farmers' crops in a time during a year.
第3题
Why did Perth develop very slowly at the beginning according to the introduction？
A．It was occupied by Britain.
B．It was a wetland.
C．It scarcely contacted the other cities.
D．It had no rich natural resources.
第4题
Why did farms expand their fields during the First World War？
A．Because they could obtain more profit.
B．Because there had been a serious drought which caused lack of food.
C．Because they wanted to find a solution to the natural disaster.
D．Because there had been a drought in the Midwest United States.
第5题
The message of【C1】______such as this is【C2】______natural systems are complex, unpredictable: understanding them【C3】______patient observation and【C4】______analysis. The lack of these conditions explains why, in the early modem era, grass snakes were killed as venomous, and gardeners【C5】______worms because they【C6】______gnaw plant roots.
The assumption that people "ought" to know about such things is based on an urban-rural divide that opened up in the 18th century. For a【C7】______of centuries, city and country people did【C8】______separate realms. But the ear, the phone, the media and the Internet have contributed to the【C9】______tendency of what we call modem lifestyle; and the vast population.【C10】______from cities into rural areas blurred the difference【C11】______urban and rural. Thus, a new word "rurban" —has been coined to【C12】______this condition. Most of us now work【C13】______or in an office, and【C14】______we are involved in our primary industries, we are【C15】______more likely to be staring【C16】______a computer than【C17】______with the landscape. Human life has turned generally into a【C18】______by work, sleep, shopping and TV-all【C19】______identical【C20】______performed in town or country.
【C1】
A．study
B．studies
C．studying
D．studied
第6题
Text
…
The message of【C1】______such as this is【C2】______natural systems are complex, unpredictable: understanding them【C3】______patient observation and【C4】______analysis. The lack of these conditions explains why, in the early modern era, grass snakes were killed as venomous, and gardeners【C5】______worms because they【C6】______gnaw plant roots.
The assumption that people "ought" to know about such things is based on an urban-rural divide that opened up in the 18th century. For a【C7】______of centuries, city and country people did【C8】______separate realms. But the car, the phone, the media and the Internet have contributed to the【C9】______tendency of what we call modern lifestyle; and the vast population【C10】______from cities into rural areas blurred the difference【C11】______urban and rural. Thus, a new word—"rurban" —has been coined to【C12】______this condition. Most of us now work【C13】______or in an office, and【C14】______we are involved in our primary industries, we are【C15】______more likely to be staring【C16】______a computer than【C17】______with the landscape. Human life has turned generally into a【C18】______by work, sleep, shopping and TV—all【C19】______identical【C20】______performed in town or country.
【C1】
A．study
B．studies
C．studying
D．studied
第7题
W: Yes, it was fantastic. Now I know why it is listed together with the Nile river as one of the great natural wonders of the world. Here, want to see the picture I took？
M: Oh, what a view! It is even bigger than I had imagined. I remember reading about the Great Valley and I think it said that it was formed suddenly when an earthquake took place.
W: Well, not that quickly. Look, the river has been wearing the valley floor away for ten million years.
M: Then the valley is the result of soil changes. I'll bet geologists have made some interesting discoveries there.
W: Not only the geologists, archaeologists have also found the bones of extinct animals in caves in the valley walls, ha a cave one hundred and forty feet 'about the river, they found driftwood that dated back as far as thirty seven thousand years.
M: That means the river must have been a hundred and forty feet higher up when it carried the driftwood into the cave.
W: It's very possible, but of course who knows. The Great Valley is full of mysteries. Wouldn't you like to go to Arizona some day？
M: You bet I would.
(23)
A．To Colorado.
B．To Arizona.
C．To the Nile River.
D．To the Museum of Natural History.
第8题
听力原文：M: Hi, Sue.
W: Hello, Jill, how are you？
M: I'm fine. Did you watch the TV special about barnacles last night？
W: No, I missed it. What did you learn about them？
M: They glue themselves to rocks in the ocean, shortly after birth. They also stay in the same place forever.
W: Right, have you ever tried removing one of these things？ It would be easier to chip the rock away than to get the barnacles off.
M: Exactly, and that's why scientists are trying to figure out what the barnacles glue is made of. It's considered one of the strongest adhesives in nature.
W: And it would have the advantage of being able to work on wet surfaces too.
M: Precisely, and because it's natural protein, it probably wouldn't be harmful to people like so many synthetic glues in use today.
W: Think of all the ways in which doctors and dentists could use such a glue to mend broken bones and fasten false teeth.
M: There could be countless uses. Scientists hope to learn soon exactly how the glue is made, so that people can make use of it.
W: That's good news for the general public. I hope it won't take long for the new glue to be put into use.
(23)
A．The reproductive cycle of barnacles.
B．A new source of protein.
C．Types of sea animals.
D．The adhesive quality of barnacles.
第9题
根据下列短文，补全 46～50 题。
Why do People Shrink？
Did you ever see the movie Honey, I shrunk the kids？ It's about a wacky(乖僻的) dad (who's also a scientist) who accidentally(偶然的) shrinks his kids with his homemade miniaturizing(使小型化) invention. Oops! The kids spend the rest of the movie as tiny people who are barely visible while trying to get back to their normal size.
_________ (1)It takes place over years and may add up to only one inch or so off of their adult height (maybe a little more, maybe less), and this kind of shrinking can't be magically reversed, although there are things that can be done to stop it or slow it down. But why does shrinking happen at all？
_________(2).As people get older, they generally lose some muscle and fat from their bodies as part of the natural aging process. Gravity (the force that keeps your feet on the ground) take hold, and the bones in the spine, called vertebrae(椎骨), may break down or degenerate, and start to collapse into one another. _________ (3).But perhaps the most common reason why some older people shrink is because of osteoporosis.
Osteoporosis(骨质疏松症) occurs when too much spongy(海绵) bone tissue (which is found inside of most bones) is broken down and not enough new bone material is made. _________ (4).Bones become smaller and weaker and can easily break if someone with osteoporosis is injured. Older people –especially women, who generally have smaller and lighter bones to begin with-are more likely to develop osteoporosis. As years go by, a person with osteoporosis shrinks a little bit.
Did you know that every day you do a shrinking act？ You aren't as tall at the end of the day as you are at the beginning. _________ (5).Don't worry, though. Once you get a good night's rest, your body recovers, and the next morning, you're standing tall again.
第 46 题 回答第1空（）
第10题
W: Yes, it was fantastic. Now I know why it is listed together with the Nile river as one of the great natural wonders of the world. Here, want to see the picture I took？
M: Oh what a view! It is even bigger than I had imagined. I remember reading about the Great Canyon and I think it said that it was formed suddenly when the earth crust split open during an earthquake.
W: Well, not that quickly. Look, here is the picture of th Colorado river. See way down at the bottom of the canyon, that river and its tributaries have been wearing the canyon floor away for ten million years.
M: Then the canyon is the result of soil erosion. I'll bet geologists have made some interesting discoveries there.
W: Not only the geologists, archaeologists have also found the bones of extinct animals in caves in the canyon walls. In a cave one hundred and forty feet above the river, they found drift wood that dated back as far as thirty-seven thousand years.
M: That means the river must have been a hundred and forty feet higher up when it carried the drift wood into the cave.
W: It's very possible, but of course who knows. The Great Canyon is full of mysteries. Wouldn't you like to go to Arizona some day？
M: You bet I would.
Where has the woman been？
A．To Colonado.
B．To Anzona.
C．To the Nile River.
D．To the Museum of Natural History.
