属于我国地势第一阶梯、第二阶梯分界的山脉有[ ] A．大兴安岭 B．昆仑山 C．

纯净的水是（　　）

A．混合物

B．纯净物

C．氧化物

D．单质

用所给词的适当形式填空。

1. He has two _____ (box) of old books under his bed.

2. Can you come with _____ (we) after school?

3. The _____ (eight) story is very interesting.

4. This kind of medicine is _____ (cheap) than that one.

5. These skirts are _____ (she). Yours are over there.

6. If it_____ (rain), I will take a taxi.

7. _____ (read and write) more is good for your English.

8. The most popular way of _____ (get) to school is walking.

9. Hainan is a good place _____ (go) sightseeing.

10. Hurry! The train _____ (leave) in five minutes.

原发性血小板减少性紫癜的检测，下列说法错误的是（）

A.血小板减少

B.束臂试验阳性

C.血块收缩不良

D.血小板形态正常

E.出血时间延长

当代大学生在“互联网+”浪潮中可以在哪些方面施展自己的才能、发挥自己的作用？谈谈自己的看法。

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