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问题
单项选择题
对有机物造成的滤池滤料污染，应用（）来消除。
A、硫酸
B、盐酸
C、硝酸
D、氯水
答案
参考答案：
D
选择题
— Did Shirley hold the party in her new house?
— No. The rooms _____.
A. had been painted
B. were being painted
C. will be painting
D. have painted
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单项选择题
砂仁具有的功效是：（）
A.温肝
B.暖肾
C.温肺
D.温中
E.回阳
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