皮肤异常干燥见于
A．虚脱
B．休克
C．甲亢
D．风湿热
E．脱水
参考答案：E
解析：脱水可引起皮肤异常干燥。
-The two astronauts had been trained for long before theyflew to space.
-Oh, they____quite a lot of difficulties. [ ]
A. might go through
B.may go through
C. should have gone through
D. must have gone through
往含I-和Cl-的稀溶液中滴入AgNO溶液，沉淀的质量与加入AgNO溶液体积的关系如右图所示。则原溶液中c（I［-］）/c（Cl［-］）的比值为（）。
A.（V2-Vl）/V1
B.V1/V2
C.V1/（V2-V1）
D.V2/V1
