Many people like dogs a lot because they’re people’s good friends. They are very smart. Dogs always give people lots of help. Here’s     1     story about them. On a     2     (sun) day, Jack and his friends went for a river to catch fish. They had a dog with them.     3     they came near the river, they put their two hats under a big tree and went to look for fish. After an hour, they didn’t catch     4     (some) fish at all. Suddenly （突然）it became windy, and the wind blew their hats away. It was a little cold. Jack and his friends didn’t want     5     (get) the two hats. So Jack     6     (tell) the dog to go for the hats. When the dog arrived near the hats, he tried to take both of them with his     7     (tooth). But it was difficult for     8     (he) to put two hats in his mouth. The dog thought for a minute.     9    （luck）, he found that one of the hats is smaller（更小）. So he put the smaller one     10     a bigger （更大）one. In this way he could carry the two hats at the same time. How smart the dog was!

Do you think rabbits are cute? If you ask an Australian this question, he     1    （shake）his head.     2     Australians, rabbits are dangerous animals, because they have almost destroyed the nature of Australia.

In the 18th century,     3    （Europe）came to Australia. They took the     4    （one） rabbit to Australia. After that, the number of rabbits increased     5    （quick）. One of the reasons is that there were no foxes or wolves in Australia at that time. Another reason is that the     6    （nature） situation of Australia was good for rabbits. As a result, the rabbits could dig holes     7    （easy）than anywhere else. Some of them were as deep as 1.5 metres. There was delicious grass everywhere,     8     the rabbits could get enough food. By the time of 1926, there were about 10 billion rabbits in Australia.

James is a farmer in Australia. He used to have     9     very large field. But there were so many rabbits and they ate the grass. Without grass, the ground quickly became dry. Many sheep and horses fell into rabbits’ homes and hurt     10    （they）. Luckily, things got better soon.

Is a crow (乌鸦）smarter than a seven-year-old kid?

When we think of clever animals, we usually think of dogs, cats, and apes (猿). But do you know that crows are among     1     (smart) animals in the world?

Crows have memories and they are able to imagine the future. This     2     (help) them solve problems like an ape. They even use tools sometimes. A crow can hold a tiny bar (棒) in     3     (it) mouth and use it to get tasty insects.

It’s usual     4     (think) that a crow in a tree hardly pays any attention     5     you. You might be wrong, though. Crows can remember human     6     (face). Some scientists believe that they can even tell other crows whether     7     human being is friendly or not.

Since twenty years ago, some scientists     8     (study) how intelligent crows are compared to humans. They found that crows were able to solve a difficult problem just as     9     (good) as a 7-year-old human. In another test, a crow solved an eight-stage puzzle within three minutes.

Therefore,     10     anyone ever calls you a “bird brain”, be sure to thank him or her for the praise (赞赏).