We try to help a person who has fainted by______.
A. rubbing his head
B. returning his blood to the brain
C. tightening his muscles
D. holding him in an upright (垂直的) position
What was the easy way？
A. To learn from the advertiser.
B. To make advertisement.
C. To send postal order.
D. To send envelopes.
【B18】
A. eaten
B. eaters
C. eats
D. eating
某射手射击1次，射中目标的概率是0．9，则他射击4次恰好击中目标3次的概率为()．
A. 0．23
B. 0．25
C. 0．27
D. 0．29
E. 0．31
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