属于胸部纵隔结构的是（）
A.胸椎
B.胸骨
C.胸膜
D.胸主动脉
E.肺叶支气管
参考答案：D
—What do you think of their school?
—It's really beautiful. But I don't think their school is as big as _____. [ ]
A. ours
B. us
C. we
D. our
音频卡采用的总线接口有ISA和（）。
