有什么石油成分臭气熏天？（）
A.气体-硫化氢
B.硫单质
C.硫化钠
参考答案：A
We should always keep ______ well-informed of the changing information.
A．us
B．ours
C．ourselves
D．we
易发生DIC的白血病是
A．CML-BCB．ALL-L2C．AML-M5D．AML-M3
