问题
选择题
一 Mom,what did your doctor say?
一 He advised me to live _____ the air is fresher. [ ]
A. in where
B. in which
C. the place where
D. where
答案
答案：D
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一 Mom,what did your doctor say?
一 He advised me to live _____ the air is fresher. [ ]
A. in where
B. in which
C. the place where
D. where
答案：D
2AB(g)达到平衡的标志是