人的胃液里含有少量盐酸，则胃液的pH可能是（ ）
A．1.2
B．7.0
C．8.5
D．13.2
盐酸属于酸，显酸性，盐酸的PH小于7．
故选A．
As you can see, the number of students using mobile phones _____ these days. [ ]
A. is rising
B. is being raised
C. have risen
D. have been raised
以律师函或附带明确索偿要求的投诉函件属于（）
A.一类投诉
B.二类投诉
C.三类投诉
D.特殊投诉
