题干
---Mom, what did your doctor say?
---He advised me to live _____the air is fresher.
A：in where
B：in which
C：the place where
D：where
答案(点此获取答案解析）
D
A：in where
B：in which
C：the place where
D：where
(g)
C(g) +D(g)发生过程中的能量变化如图，△H表示反应的焓变。
