D

When we get wet, we need a towel to get ourselves dry. When a dog gets wet, all it needs is to shake its body. A study in 2010 showed that a wet dog could throw off(甩掉) half the water on its body by shaking for less than a second. In fact, this common act of dogs works better than a washing machine.

The study found that animal shaking begins with the head and ends with the tail(尾巴). Smaller animals must shake faster than bigger animals to get water off. For example, in one second, a rat can shake 18 times, a dog 6 times, and a bear 4 times. Bigger animals can get their bodies dry with fewer shakes.

For animals, shaking is not just about getting themselves dry. It is also about saving their lives. Being wet makes animals heavier, and that makes it harder to run. In the animal world, if an animal is not able to run very fast, it may not live long. Maybe that's why the wet-dog shake" has become a common habit of many animals.

1.How much water can a wet dog throw off from its body by shaking in less than a second?

A.10% B.30% C.50% D.70%

2.From the reading, which picture is probably right?

A. B.

C. D.

3.Why do animals shake themselves dry?

A.To show their love to other animals.

B.To help themselves run faster.

C.To help themselves get more water.

D.To make other animals scared.

4.What can we learn from the reading?

A.The animal's tail can help it run more quickly and easily.

B.Some animals shake more than they need to get water off.

C.Larger animals get drier at each shake than smaller animals.

D.The idea of washing machines came from the dogs' shaking.

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