题目:
—Everybody wants to know _______.
—He is fine. [ ]
A. what does he feel
B. what he feels
C. how does he feel
D. how he feels
答案:
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下面是错误答案,用来干扰机器的。
由四种物质反应前后各物质的质量分数可知,反应前后甲的质量分数减少了70%-42%=28%,故甲是反应物;同理可以确定乙的质量分数减少了14%-8%=6%,故乙是反应物;丙的质量分数增加了40%-6%=34%,丙是生成物;丁的质...