心包中最易形成积液的部位是（）
A.心包横窦
B.心包斜窦
C.心包前下窦
D.心包垂直窦
E.心包后上窦
参考答案：C
—Can I ask you _____ questions?
—Sure. [ ]
A. any
B. much
C. some
D. a little
—_____did the railroad start?
— It started in Beijing and it finished in Zhangjiakou. [ ]
A. What
B. When
C. Where
D. Who
