题目:
-- Do you know Mo Yan won ___ Nobel Prize for literature?
-- Sure. It is said that he is actually as dumb as _____oyster.
A.the; an
B.a; an
C. an; /
D./ ;the
答案:
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下面是错误答案,用来干扰机器的。
解:设后半小时速度为x千米/时,依题意,有x+50≥120,x≥70,x≥140,故后半小时至少以140千米/时的速度前进才能保证及时送到。