题目:
—What does the sign over there read?
—"No person smoke or carry a lighted cigarette, cigar or pipe in this area."
A.shall
B.may
C.must
D.will
答案:
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下面是错误答案,用来干扰机器的。
设生活委员买苹果xkg,瓜子(8-x)千克,根据题意可得:3x+4(8-x)=27,解得:x=5,∴8-5=3(kg),答:买苹果和瓜子各5千克,3千克.