维生素A缺乏症最早出现的症状是()
A.皮肤干燥
B.暗适应差
C.角膜干燥
D.角膜软化
E.毛囊角化
参考答案:B
—I haven’t heard from Henry for a long time.
—What do you suppose________ to him?
A.will happen
B.has happened
C.was happening
D.had happened
小学教室前排课桌距黑板不应少于()
A.3.0m
B.2.5m
C.2.0m
D.1.5m
E.1.0m