利用二分法在序列61，87，154，170，275，426，503，509，512，

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问题单项选择题

利用二分法在序列61，87，154，170，275，426，503，509，512，612，653，677，703，765，897， 908中查找关键码值为612的结点，需要查找几次

A．2

B．3

C．4

D．5

答案

参考答案：B

解析：第一次查到509；第二次查到677；第三次查到612，查找结束。

填空题

词形变化.

1. Mr. Smith and his family _______ (be) in the park now.

2. Do you go _________ (fish) at the weekends?

3. There are two ________ (library) in our school.

4. On the _____ (five) floor, there are two toilets.

5. Let _____ (I) have a look.

6. Would you like _________ (go) with me?

7. What _ she usually ___ (eat) for lunch?

8. (not look) out of the classroom.

9. Who ______(have) a pet in your class?

10. My ball is blue. ______(She) is yellow.

单项选择题

患者女，70岁，急性下壁心肌梗死，收入CCU病房。患者出现下列哪种心律失常最危险（）。

A.窦性心动过速

B.偶发房性期前收缩

C.窦性心律不齐

D.三度房室传导阻滞

E.偶发室性期前收缩