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问题 单项选择题

驻波电子直线加速器，加速电场平均为()

A．50KV/cm 

B．100KV/cm 

C．140KV/cm 

D．180KV/cm 

E．200KV/cm

答案

参考答案：C

单项选择题

.InternetExplorer把各种Web站点分成（　）安全区域，并对各个区域分别指定不同的安全等级。

A．2种

B．3种

C．4种

D．5种

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填空题

用括号内所给词的适当形式填空。

1. ______ (I) baseball is here. Do you want to play baseball with me?

2. I have two ______ (dictionary), a Chinese dictionary and an English dictionary.

3. This is the ______ (one) day of the new term (学期).

4. ______ (be) you Mr. Black?

5. I have two ______ (watch). One is pink. The other is black.

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