岩石
参考答案：岩石是一种或几种矿物的集合体。自然界的岩石按成因可分为岩浆岩、沉积岩、变质岩三大类。
"There is ______ in today's newspaper, so you needn't read it," the father says to his son.
A．anything interesting
B．interesting anything
C．nothing interesting
D．interesting nothing
小儿出现生理性流涎的年龄是（）
A.1～2个月
B.3～4个月
C.5～6个月
D.7～8个月
E.12个月
