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当基本闭塞设备不能使用时，应根据列车调度员的命令采用（）闭塞法行车。
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【单选题】Global warming is already cutting substantially into potential crop yields in some countries—to such an extent that it may be a factor in the food price【C1】______ that have caused worldwide stress in ...
A.
decreases
B.
reductions
C.
increases
D.
additions
【单选题】Nevertheless, the United States maintained its military ______ in some African and West ern Asian countries despite international protest.
A.
attachment
B.
involvement
C.
interaction
D.
communication
【单选题】Recently, the Chinese government gave some examples of _______ Dalai Lama’s visiting foreign countries had affected China.
A.
that
B.
what
C.
how
D.
whether
【单选题】Why does the student mention the African Student Association?
A.
Because some jazz lovers are from the African Student Association.
B.
Because African music has influenced jazz.
C.
Because the African Student Association once held a jazz concert.
D.
Because the African Student Association plays jazz very well.
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