阵发性室性心动过速需要及早终止其发作，其最主要的原因是（）

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问题单项选择题

A.可引起心源性休克

B.可引起心功能不全

C.可引起心绞痛

D.可发生栓塞

E.可发展为心室颤动

答案

参考答案：E

填空题

按提示完成单词。

1. Betty's___________ (生日) is coming. We will buy her a present.

2. Don't buy that dress．It's too ____________ (贵)．

3. Whose ___________ (随身听) are these?

4. Idon't think the black coat ____________ (适合) you. You may change it.

5. Are there any___________ (折扣) on this year's clothes?

6. The sports shoes on the table are one of the ___________ (play).

7. How ________ (care) you are! You have made such a mistake.

8. He held a party without ____ (invite)us．

9. There are many ______ (visit) in our city in summer.

10. He was ________ (happy) because he got 58 points in the exam .

单项选择题

风速是随时变化的，通常测量风速用（）分钟内的平均值

A.1

B.2

C.3

D.4