题干
It is a strange phenomenon that some young people today think it is their parents’responsibility to earn money and_______ to spend it.
A：them
B：they
C：their
D：their
答案(点此获取答案解析）
D
（g）+H2（g）⇌CH3CH2CH2CH3（g）△H1
（g）+H2（g）⇌CH3CH2CH2CH3（g）△H2