胸部CT高分辨率扫描主要用于检查（）
A.中心型肺癌
B.气胸
C.胸腔积液
D.胸膜增厚
E.间质性病变
参考答案：E
3个月的婴儿，术中允许的血细胞比容是（）。
A.0.35
B.0.30
C.0.25
D.0.20
E.0.15
The crash was __________ by millions of viewers who were watching the race on TV.[ ]
A. witnessed
B. heard
C. found
D. watched
