下列物质中，玻璃离心管可以盛放（）。
A、有机溶剂
B、酶溶液
C、盐溶液
D、普通水溶液
参考答案：A, B, C, D
Had you listened to the doctor, you _____ all right now.
A．are
B．were
C．would be
D．would have been
人体每天从食物中摄入的氟是全身氟来源的
A．5%
B．15%
C．25%
D．35%
E．45%
