我国经济社会发展的（）是科学发展观形成的现实依据。

A.阶段性特征

B.经济基础

C.实践经验

D.理论基础

用括号内所给单词的适当形式填空。

1. Our library needs 45 Chinese-English____  (dictionary).

2. The boy enjoys____(play) chess with his grandfather.

3. His sister is a nurse now, but she wants        (be)a reporter.

4. These sports____ (activity) are for students.

5.--What's the weather like in your city?   

   -- It is      (sun)．