根据句意及首字母提示补全单词。

1. People can enjoy n_______ in the countryside.  The air is fresher and the sky is bluer there.

2. She c_______ the table with a cloth yesterday.

3. In the o_______, there are all kinds of fishes.

4. She was full of j_______ because her parents love her.

5. Thousands of old trees were in the f_______ ten years ago, but now there are few.

金融期货的正常功能有( )。

A．套期保值

B．套期获利

C．价格发现

D．避免利率风险

E．减轻利率风险