脑对冲伤最容易受伤的部位（）。
A.小脑
B.脑干
C.额叶
D.顶叶
E.枕叶
参考答案：C
解析：因前颅凹底有骨嵴，凹凸不平，容易发生对冲伤。
Parents now believe that there are obvious differences in their approach to educating children compared with _____ of their parents.
A．those
B．that
C．one
D．ones
构成心瓣膜的结构是
A．心肌
B．心外膜
C．心内膜
D．浆膜
E．内皮
