The Slowest and the Fastest

　　The state of Florida was once almost gobbled (大吃) up by snails(蝸牛). 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?

[　　]

A．30 miles per hour
B．35 miles per hour
C．40 miles per hour
D．50 miles per hour

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

[　　]

A．a(chǎn) rabbit
B．a(chǎn) human
C．a(chǎn) greyhound
D．a(chǎn) gazelle

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

[　　]

A．5 miles per hour
B．10 miles per hour
C．15 miles per hour
D．20 miles per hour

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

[　　]

A．a(chǎn) human
B．a(chǎn) greyhound
C．a(chǎn) chicken
D．a(chǎn) rabbit

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

[　　]

A．50 miles per hour
B．45 miles per hour
C．40 miles per hour
D．30 miles per hour
答案：B;D;B;A;D
提示：

gazelle [g+>zel] 羚


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    How's it going? Sorry I haven't emailed for a while, but I had so much to do!

    I had told you about my decision to take up a sport. I knew I wasn't fit and I wanted

to get some exercise. But that wasn't the only reason that I decided to do a sport. Students

who play sports do better at school.1.                  Exercise also helps learning

and memory (記憶).

2.                  First, I tried soccer. I had played a bit of soccer before

and I thought it wouldn't be too bad. I knew I couldn't nm for very long without feeling

tired. On the first day, I was able to nm for the first ten minutes, but then I was so tired

that I couldn't even kick the ball!

    Then, I tried volleyball. 3.                 I was able to nm for the first twenty

minutes and I wasn't the slowest runner in the team! After a few weeks .I could run faster

and longer. I was doing better and feeling better. 4.              Maybe I'm

not a team sport person after all!

    Finally, I tried kung fu. It's a great sport that exercises the body and the mind. You learn to follow instructions carefully and do what you are asked to do. This is the fight sport for me! 5.                   I feel so confident that l even showed some moves to the class last week! Can you believe it?

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