阅读下列短文, 从所给的四个选项中, 选出最佳答案. A tree frog (蛙) is less than an inch long, yet its lo

阅读下列短文, 从所给的四个选项中, 选出最佳答案。

    A tree frog (蛙) is less than an inch long, yet its loud and clear call can be heard almost a mile away. It is hard to find where this sound comes even though the creature may be sitting nearby. Probably more persons hear than ever see the tiny animal. Only the full-grown male can sing, and the performance is a surprising sight to watch. The tree frog sits on its hind legs, leans back and sings. With itsmouth closed, the frog makes four two-one notes. The sac (囊) under its chin (下巴) is then a bag of loose skin. To call again, it must take another breath. A spell of cool weather may make the frogs quiet for a while, but the next warm spring night, they will be singing again.

1. We can infer (推断) from the passage that the tree frog must sit down in order to ________.

[    ]

A. sing

B. avoid being seen

C. rest its hind legs

D. eats its food

2. What does the first sentence mean?

[    ]

A. The tree frog's song is not loud, but it can be heard a mile away.

B. Because it is small, the tree frog's song can't be heard a mile away.

C. Although the tree frog is small, its song can be heard a mile away.

D. When it is an inch long, the tree frog can be heard a mile away.

3. According to the author, the frog sings without ______.

[    ]

A. leaving its hiding place

B. making much noise

C. opening its mouth

D. singing the same songs again

4. In line 10, the word "spell" could be taken place of by _____.

[    ]

A. day

B. short period

C. season

D. month

5. It is clear from the passage that the tree frog is ___

[    ]

A. not easy to be noticed

B. not friendly to humans

C. easily seen in most woods

D. easily frightened by noise

试题答案

答案：A;C;C;B;A