西汉初年，统治者要解决的首要问题是[ ]

A．消除秦王朝的残余势力

B．恢复发展生产

C．学习秦朝的政治制度

D．加强中央集权

根据句意及首字母的提示，补全单词。

1. The short man looks o _        , but he is a great scientist.

2. At last, the thief d_      _ out of our eyes. We were very worried.

3. Many policemen were there to s        _ people after the earthquake.

4. Our parents d        _ with our ideas sometimes. But don't worry. Try to show yours to them.

5. Using too much p _       bags is bad for our environment.