________， what could we do？
A. Should it rain tomorrow
B. Tomorrow it should rain
C. If it rains tomorrow
D. If it will rain tomorrow
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The Netherlands is the only country in Europe which permits euthanasia， ________ it is not technically legal there.
A. if
B. otherwise
C. although
D. unless
煤尘爆炸的下限浓度是()。
A. 45mg/m3
B. 45g/m3
C. 2000mg/m3
曹操与王允见面后关于落座几次的推让是一种礼仪的表现，但背后暗藏的是一种相互试探。()
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