根据句子意思，用括号中所给词的正确形式填空。

1. Many students are________ (sleep) in class today because of the bad weather.

2. She couldn't say a word because of the                  (sad).

3. He is interested in Dolly, the first_______ (clone) sheep.

4. Rose doesn't like going out. She is an _________ (active) girl.

5. They are never                (satisfy) with what they've got.

地理信息具有复杂、多维的特点，其变量筛选分析方法有（）

A.主成分分析法

B.系统动力法

C.关键变量分析法

D.投入产出法

E.主因子分析法