板块构造学说的观点认为地球表层划可分为[ ]
A、四大板块
B、五大板块
C、六大板块
D、七大板块
答案:C
— What do you want to eat for lunch? I will prepare earlier today.
— Honey, you_____. Let’s go out to have something different.
A.mustn’t
B.can’t
C.shouldn’t
D.don’t have to
胸腔积液时,每次抽液量不应超过多少()。
A.600ml
B.700ml
C.800ml
D.900ml
E.1000ml