与角膜营养有关的有（）
A.空气
B.泪液
C.神经支配
D.房水
E.玻璃体
参考答案：A, B, C, D
My daily school life is different from the past. I _____ lessons when I was a child. Now, I like them most. [ ]
A. get used to hating
B. used to hate
C. used to like
D. didn't use to hate
塑造华北平原的主力是中国“第二长河”，它是[ ]
A．黄河
B．淮河
C．海河
