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【单选题】
按照真空区域的划分,低真空的真空度为 。()A.
105~102
B.
102~10-1
C.
10-1~10-6
D.
＜10-6
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【单选题】The man in our classroom my English teacher. He went to Beijing this morning.
A.
mustn’t be
B.
can’t be
C.
may be
【简答题】阅读短文，选择正确答案。 A small man went to a cinema, bought a ticket and went in. But after two or three minutes he came out, bought a second ticket and went in again. After a few minutes, he came out again and...
【单选题】The man was seen the park. But now we couldn't find him there.
A.
enter
B.
to enter
C.
going
D.
went into
【单选题】Why couldn't the man meet the woman at her house?
A.
The woman went to the man's house.
B.
The woman was in her office.
C.
The woman was on her way back hom
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