单项选择题

What is the proper relationship between them()

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A.Boss and secretary.
B.Doctor and nurse.
C.Teacher and student.
D.Lawyer and client.

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What is the meaning of ......the PSAs offer a virtual presence for ground crews and scientists, ...... (Paragraph 1) ()

A.With the help of PSAs, the ground crews and scientists can present in real time in the spacecraft.
B.With the help of PSAs, the ground crews and scientists can control the spacecraft as if they were there.
C.With the help of PSAs, the ground crews and scientists cannot in real time present in the spacecraft.
D.With the help of PSAs, the ground crews and scientists cannot advise the astronauts to deal with different situations.

单项选择题
What made the man’s opponent lose the case()

A.That he didn’t send some wine to the judge.
B.That the wine he sent the judge was not so good as the man’s.
C.That he forgot to write his name on the card.
D.The man’s clever trick.

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