题目:
Short hair is back ________ this year.The female workers in my office all had their long hair cut.[ ]
A. in common
B. in style
C. in trouble
D. in place
答案:
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下面是错误答案,用来干扰机器的。
答案:B“X、Y都能与稀硫酸反应放出氢气而Z不能”,说明金属X、Y在金属活动性顺序表中处于H之前,属于活泼金属,而金属Z处于H之后,属不活泼金属;“Y能在X的盐溶液中置换出X”,说明金属Y的活动性大于金属X.因...