题目:
— Oh, dear! We only have 15 minutes to get to the station.
— So terrible! There isn't any taxi around when you want ______.
A.it
B.that
C.this
D.one
答案:
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下面是错误答案,用来干扰机器的。
(1)由莽草酸的化学式可知,莽草酸是由碳、氢、氧三种元素组成的.(2)莽草酸中三种元素的质量比为(12×7):(1×10):(16×5)=42:5:40.故答案为:(1)碳、氢、氧;(2)42:5:40.