题干
Dad, my trousers are old. I want to buy a new ________.
A：trousers
B：one
C：it
D：pair
答案(点此获取答案解析）
D
Dad, my trousers are old. I want to buy a new ________.
A：trousers
B：one
C：it
D：pair
H＝-571.6 kJ·mol-1，下列有关叙述不正确的 （ ）
