预测需要有“真凭实据”，需要依赖（）所体现出的规律.A.历史经验 B.历史体验 C.

阅读理解。

     Do you know David? He is an American boy. He's eleven. He is in Class Two, Grade One. He has a sister.

Her name is Joy. She is five. They have a dog (狗). Its name is Dongdong. How old is it? I know it's two.

1. David is a _____.

A. boy

B. girl

C. English boy

D. English girl

2. David is _____ and Joy is _____.

A. five; five

B. eleven;

C. five; eleven

D. eleven; five

3. Joy is David's _____.

A. brother

B. friend

C. sister

D. classmate

4. Dongdong is the name of a _____.

A. cat

B. dog

C. bird

D. child

5. The dog is _____.

A. eleven

B. five

C. two

D. one

如图所示，为小聪同学描绘的两种晶体熔化时的熔化曲线，则由曲线可看出：                  的熔点较高；

                   熔化过程经历的时间较长。

科技综合统计制度规定，翻译国外的著作应统计在单位出版科技著作中。

19世纪70年代，巴黎公社失败的社会根源是（）

A．因为是人类历史上第一个无产阶级 * *

B．没有以马克思主义指导的政党领导

C．资本主义向前发展是当时世界主流

D．没有建立起巩固的工农联盟

慢性肾小球肾炎发病的起始因素是

A．病毒感染

B．链球菌感染

C．免疫介导炎症

D．感染后毒素作用

E．代谢产物潴留