皮皮学，免费搜题
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【简答题】
A．Because he is too young to catch that. B．Because he has not been exposed to that. C．Because his sister hasn't caught that. D．Because he has been immunized recently.
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举一反三
【单选题】Passengers should Flight BA125 to Berlin.
A.
check in for
B.
check on
C.
check out
D.
check off
【简答题】Promissory Note Check Bounced check Bill of Exchange
【单选题】How to check the quality during production?
A.
check every one
B.
take samples to check it
C.
check it at random
【单选题】Passengers should ______ for flight BA125 to Berlin.
A.
check in
B.
check off
C.
check up
D.
check out