The Slowest and the Fastest

　　The state of Florida was once almost gobbled (大吃) up by snails(蜗牛). They were giant(巨大的) snails from Africa. A visitor took some to Florida, where they spread quickly. Some of the snails were as big as a person's hand. They ate the leaves on trees and other plants. They had to be stopped, and they were. Poison killed thousands of the snails, and Florida was saved.

　　Catching a snail should be easier than catching any other animal. The snail is the slowest of all land animals. Its top speed is 55 yards per hour. At this speed it would take the snail about 32 hours to travel one mile. A snail only goes that fast when it's very hungry.

　　The bar graph below shows some other top speeds.

　　A bar graph has bars of different lengths, instead of pictures. This kind of graph makes it easy to compare several things quickly. To read the graph, notice where each bar ends. Then find the closest number at the bottom of the graph.

　　Use the bar graph about running speeds to answer the questions.

1．What is the top speed of a rabbit?

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2．Fifty miles per hour is the top speed for ________ .

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3．What is the difference in running speed between a greyhound and a gazelle?

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4．The closest to an elephant in running speed is ________ .

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5．A rabbit and greyhound can both run faster than ________ .

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根据句意及首字母提示补全单词

Bars k________ the animals inside.

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.

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A．eating good food

B．living in cages

C．living with other animals

D．living in natural conditions

2．In modern zoos ________.

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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.

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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 ________.

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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 ________.

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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