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题型:阅读理解-阅读单选 难度:0.65 引用次数:88 题号:12714858

Crocodiles today look very similar to ones from 200 million years ago. There are also very few species alive today---just 25. Other animals such as lizards(蜥蜴)and birds have achieved a diversity of many thousands of species in the same amount of time or less.

Prehistory also saw types of crocodile we don't see today, including giants as big as dinosaurs, plant-eaters, fast runners and snake-like forms that lived in the sea. The rate of their evolution is generally slow, but occasionally they evolve more quickly because the environment has changed. In particular, their evolution speeds up when the climate is warmer, and their body size increases.

The body size of crocodiles is important because it interacts with how fast animals grow, how much food they need, how big their populations are and how likely they are to become extinct. The limited diversity of crocodiles and their apparent lack of evolution is a result of a slow evolutionary rate. It seems the crocodiles arrived at a body plan that was very efficient and perfect enough that they didn't need to change it in order to survive. This perfection could be one explanation why crocodiles survived Cretaceous period(白垩纪), in which the dinosaurs died out.

Crocodiles generally develop better in warm conditions because they cannot control their body temperature and require warmth from the environment. The climate during the age of dinosaurs was warmer than it is today, and that may explain why there were many more varieties of crocodiles than we see now. Being able to draw energy from the sun means they do not need to eat as much as a warm-blooded animal like a bird or a mammal(哺乳动物).

1. What influenced the evolution of crocodiles most?
A.Their number.B.The climate.C.Their habits.D.Food resources.
2. Why did crocodiles go slowly in evolution?
A.As a result of their good appetite.
B.Because of their perfect body type.
C.Owing to so many dinosaurs around.
D.Due to their limited ability to reproduce.
3. We can infer from the last paragraph that crocodiles ________.
A.are warm-blooded animalsB.like cold living conditions
C.eat less than mammalsD.are fiercer than dinosaurs
4. What is the text mainly about?
A.The history of crocodiles,
B.Ancient animals' evolution.
C.Residents of the Cretaceous period.
D.The "stop-start" pattern of crocodiles' evolution.

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【推荐1】I have seen how having an animal in your life can make things much better for all concerned. Here are some reasons.

A pet’s love never stops.

    1    . Even if you cannot return that unconditional love, just knowing that it is there will make your life better.

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Just the act of petting a creature lowers your blood pressure and helps you relax.

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“Animals are smart in the context in which they need to be smart,” says Mark Hauber, an animal behavior researcher at the University of Illinois. who co-authored the new study. He wanted to see whether yellow warblers had the capacity to remember their own important warning call known as a seet. The birds make the call only when a cowbird is near. When yellow warbler females hear it, they go back to their nests and sit tight. But it's been unclear whether they still remember the warning in the morning.

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