12. He sat at the desk ,________a novel.
A.read
B.to read
C.reading
D.reads
答案:C
什么是四项基本原则?为什么要坚持四项基本原则不动摇?
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放射性物品除具有放射性外,还具有易燃性、氧化性、不可抑制性和毒害性。()