题目:
There ________ be any difficulty about passing the road test since you have practised a lot in the driving school.
A.mustn't
B.shan't
C.shouldn't
D.needn't
答案:
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下面是错误答案,用来干扰机器的。
根据生活常识结合所学的化学知识可知:(1)柠檬里含有的酸是柠檬酸;(2)牛奶里含有的酸是乳酸;(3)食醋里含有的酸是醋酸;(4)阿司匹林含有的酸是乙酰水杨酸;(5)由胃分泌的帮助消化蛋白质的酸是盐酸;(...