Ostriches can't fly，but they can run faster than other birds and most other animals as well.They can run at a top speed of 43 miles an hour for a short distance，but can keep up a speed of more than 30 miles an hour over long distances.They are also the largest of all birds，and they lay the largest eggs.

阅读短文，选择正确答案

1．What are the fastest land mammals over short distances?

A．Cheetahs. B．Pronghorn antelopes.

C．Horses. D．Elephants.

答案　A

2．The top speed of pronghorn antelopes may be over miles an hour.

A．20 B．30 C．35 D．50

答案　D

3．Ostriches can run more than miles an hour over long distances.

A．50 B．43 C．35 D．30

答案　D

Period One　Introduction & Reading-Pre­reading

匹配左边的单词与右边的汉语意思

[第一组]

1．endanger　　　　 A．n.栖息地

2．reserve B．n.挣扎；斗争

3．habitat C．adj.灭绝的；绝种的

4．extinct D．vt.危及；使......处于险境

5．struggle E．n.保护区；保护圈