肺炎链球菌肺炎的痰液典型呈（）。
A.黑色
B.黄色
C.粉红色
D.铁锈色
E.绿色
参考答案：D
血中Hb含量低于多少时，即使重度缺氧，亦难发现发绀（）
A.<50g/L
B.<60g/L
C.<70g/L
D.<80g/L
E.<90g/L
—Why didn’t you tell him about the meeting?
—He rushed out of the room _____ I could say a word.
A．before
B．until
C．when
D．after
—Why didn’t you tell him about the meeting?