感染性发热在发热病因中占()。
A.30%~40%
B.40%~50%
C.50%~60%
D.60%~70%
E.70%~80%
参考答案:C
The pregnant woman always sits in the nonsmoking area of restaurants to reduce her exposure ________ smoke.
A.to
B.with
C.in
D.from
蓄满产流与降雨量和土湿有关,与()无关。