资源性国有资产指国家拥有的（）等资源。
A.土地
B.矿藏
C.河流
D.森林
E.沼泽
参考答案：A, B, D
These days students in some schools ______ not to use mobile phones. [ ]
A. ask
B. asked
C. are asked
D. were asked
成人大量血胸，出血量多（）
A.>300ml
B.>500ml
C.>100Oml
D.>1500ml
E.>2000ml
