题目内容

There is a ______ between them.

A. different
B. difference
C. vary
D. distant

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This is ______ we should do.

A. who
B. what
C. which
D. where

Will this ______ fresh water supply on board?

A. related
B. permmit
C. affect
D. effect

The separator may be working ______.

A. security
B. commonly
C. normally
D. often

Bearing knock is found, it ______ remedying.

A. leads
B. find
C. work
D. needs

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