Bats are the only flying mammals(哺乳动物) in the world. They can't see very well. It was long believed that all bats are blind. “Blind as a bat” is often heard.

　　Yet they have no trouble flying on the darkest nights and finding their way around very well. How can bats fly and see at night? They fly by radar(雷达).

　　The bat's radar system(雷达系统) works the same way as the one that ships and planes use. As a bat flies through the air, he makes a sound that is too high for our ears to hear. When the sounds hit things, they come back. The bat's ears receive the messages. In this way they are able to tell the bats where the things are.

　　Bats go out to look for food at night. Some people have the bats as bad animals. In fact, they are useful animals.

1．This article (文章) tells us about ________ .

[　　]

A．the bat like a bird with things

B．the radar

C．a blind man

D．the bat used for playing table tennis

2．The bat is ________ .

[　　]

3．“As blind as a bat” means a person who is ________ .

[　　]

4．Bats have no trouble flying on the darkest nights because ________ .

[　　]

A．they have very poor sight(视力)

B．they have a kind of radar system to help them

C．they have to look for food

D．they can see things in the dark nights

5．Bats go out to look for food ________ .

[　　]

A．at noon

B．in the afternoon

C．during the day-time

D．after the sun sets and before the sun rises

　　People often collect things. Stamps and books are very common (普通的). But the collection of my uncle's is something unusual. He has 1,900 clocks. There are clocks in every room of his house. The living-room is full of shelves and he filled（装满）them with clocks. Still there is not enough room for so many clocks. My uncle has to fill many boxes with them and has put them in the toilet（厕所）. Every day my aunt has to clean all the clocks and it's no easy job for her. And she also hates（憎恨）the noise（噪声）of the clocks. Each one keeps its own time. so the sound of the clocks is always there from morning till night. My aunt never knows what time it is!

阅读理解

　　Modem zoos are different from those built fifty years ago. At those zoos were places where people could go to see animals from many parts of the world. The animals lived in cages with iron bars. Although the zoo keepers took good care of them, many of the animals did not feel comfortable, and they often fell ill.

　　In modem zoos, people can see animals in more natural conditions. The animals are given more freedom in large places so that they can live more comfortable as they would in nature. Even the appearance of zoos has changed. Trees and grass grow in cages, and water flows through the places the animals live in. There are few bars; instead, there is often a deep ditch, filled with water, which surrounds a space where several sorts of animals live together as they would naturally. In an American zoo, the visitors can walk through a huge special cage that is filled with trees, some small animals and many birds. It is large enough for the birds to live naturally. In a zoo in New York, with the use of special night light, people can observe certain animals that are active only at night, when most zoos are closed. Some zoos have special places for visitors to watch animals that live in the desert or under water.

　　Modern zoos not only show animals to visitors, but also keep and save rare animals. For this reason, fifty years from now, the grandchildren of today's visitors will still be able to enjoy watching these animals.

1．It seems that ________ is something most important for animals.

[　　]

A．eating good food

B．living in cages

C．living with other animals

D．living in natural conditions

2．In modern zoos ________.

[　　]

A．different kinds of animals are kept separately

B．animals are no longer taken good care of

C．animals have more freedom

D．visitors can walk wherever they like

3．In a modern zoo ________ feel comfortable.

[　　]

A．the animals, not the visitors

B．the visitors, not the animals

C．neither visitors nor animals

D．both visitors and animals

4．In some zoos people can ________.

[　　]

A．walk through huge special cages to watch all sorts of animals

B．see animals which live in special conditions

C．during the day observe animals that are active at night

D．watch all the rare animals that may not be seen in the future

5．The main idea of the passage is that ________.

[　　]

A．zoos are new places where animals can live naturally

B．zoos are places where people can see animals from all over the world

C．there should be old and modern zoos alike

D．rare animals may soon die out