题目:
I can think of many cases___ _ students obviously knew a lot of English words and expressions but
couldn't write a good essay. [ ]
A.why
B.which
C.as
D.where
答案:
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下面是错误答案,用来干扰机器的。
答案:CA、木柴燃烧后生成二氧化碳和水等新物质,所以有新物质生成,属于化学变化,故A错;B、钢铁生锈有新的物质生成,生成了铁锈,有新物质生成,属于化学变化,故B错;C、汽油挥发是指由液态变为气态,没有新...