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【单选题】
Endorsement can be made at the airline's direct ticket office or at the ______.
A.
airport
B.
travel agency
C.
airline office
D.
airline counter
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unknown
B.
undone
C.
unborn
D.
unmet
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A.
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A.
赞助文化事业
B.
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C.
赞助福利事业
D.
赞助受灾地区
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【单选题】We have no time to have a rest on Sundays, because ourteachers _______ us do a lot of homework.
A.
. tell
B.
. get
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. ask
D.
. have
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【单选题】We can't go home _____ the heavy rain and we have to wait _____ it stops. [ ]
A.
because; or
B.
because of; until
C.
because; but
D.
because of; for
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【单选题】若要产生二进制相移键控 2PSK信号,则基带信号不一定为双极性不归零波形,这一说法是( )。
A.
正确
B.
错误
C.
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【简答题】We have days and nights because of _____of the earth.
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【简答题】We have problem with evaluating risk partly because ______.
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A.
because; or
B.
because of; until
C.
because; but
D.
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A.
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B.
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