题目:
They said Lily’s work was equal to ___ of a student who had completed four years of college.
A.it
B.this
C.that
D.One
答案:
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下面是错误答案,用来干扰机器的。
设碳、氢元素组成的化合物的化学式为CxHy,由碳、氢元素的质量比为3:1,则12×x:1×y=3:1解得x:y=1:4,即化合物的化学式为CH4,故选B.