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问题
单项选择题
碘的主要排泄途径是（）
A.皮肤
B.肾脏
C.粪便
D.汗液
答案
参考答案：
B
选择题
The number of people present at the concert was ____ than expected. There were many tickets left.
A. much smaller
B. much more
C. much larger
D. many more
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问答题 简答题
焦虑性失眠与抑郁性失眠在失眠的主要特点上有何区别？
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