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问题 单项选择题

保价包裹登入包价包裹封发清单时要注明每件的重量、总重量，保价金额大于等于（）元的，应另加注保价金额。

A.300

B.500

C.1000

D.2000

答案

参考答案：C

句型转换

句型转换。

1. I have a cold, too. (改为同义句)

     I_______ have a cold.

2. The boy went to bed after his mother came back.  (改为同义句)

    The boy _______ go to bed _______  his mother came back.

3. You are not feeling well. (改为同义句)

     You _______  feel well.

4. I think she can swim very well. (改为否定句)

    I ________ think she _______  swim very well.

5. He's getting a cold. (就画线都分提问)

   _______ _______  with him?
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单项选择题

脉冲电场凝胶电泳的电场为（）

A、高压电场

B、低压电场

C、不变电场

D、正交的交变脉冲电场

E、不变脉冲电场
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