闪光视觉不应见于
A．眼球外伤
B．青光眼
C．急性玻璃体后脱离
D．急性视网膜脉络膜炎
E．视网膜脱离
参考答案：B
Clothing made of man-made fibers has certain advantages over ______ made of natural fibers like cotton，wool or silk.
A．one
B．those
C．that
D．what
医生用什么药使运动员很快消除疼痛呢？（）
A.氯乙烷
B.二氯乙烷
C.三氯乙烷
D.四氯乙烷
