关于肺部的叙述,错误的是()
A.肺位于胸膜腔
B.左右两肺分居纵隔两侧
C.左肺分上、下两叶
D.肺尖经胸廓上口突至颈部
E.右肺分上、中、下叶
参考答案:A
I won't go to the concert this evening. I ______ watch the NBA on TV. It's more exciting. [ ]
A. had better
B. would rather
C. ought to
D. have to
如何正确认识言词原则和直接原则?