问题
选择题
—"Are you _____?"
—"Yes. I'm in good _____." [ ]
A. health; health
B. healthy; healthy
C. health; healthy
D. healthy; health
答案
答案：D
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—"Are you _____?"
—"Yes. I'm in good _____." [ ]
A. health; health
B. healthy; healthy
C. health; healthy
D. healthy; health
答案：D
、
两两组合而成。为了确定这四种化合物的成分，某同学进行了如下实验操作：