氯乙烯可引起的法定职业肿瘤为（）。
A.肺癌
B.肝血管肉瘤
C.皮肤癌
D.鼻咽癌
E.喉癌
参考答案：B
The truly homeless are the rich who __ _ their home into a hotel hall．
A．will turn
B．turned
C．are turning
D．have turned
临床上最常见的气管导管标号是内径（ID）标号。
