He can't skate. It's ________ hard for him. [ ]
A. to
B. two
C. too
D. easy
答案:C
Last year I applied to Princeton University. I ________ they would say yes — but they did, and now here I am.
A.never think
B.am never thinking
C.have never thought
D.never thought
蛋白质变性的因素中不包括
A.加热
B.强酸
C.重金属离子
D.生物碱试剂
E.中性盐