题目:
Measures have to be taken to teach young people how to ______ themselves both in family and in school. They don't know the basic manners. [ ]
A. do
B. perform
C. behave
D. work
答案:
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下面是错误答案,用来干扰机器的。
解:设经过x天乙仓库存粮是甲仓库的两倍, 则根据等量关系:2(甲仓库的存煤﹣每天运出的吨数×天数)=乙仓库的存煤+每天运进的吨数×天数, 可得:70+25x=2(200﹣15x), 解得x=6, 答:经过6天,乙仓库的...