下列物质属于氧化物的是( )
A.高锰酸钾
B.氯酸钾
C.氧气
D.水蒸气
答案:D
We should learn to experience and enjoy failure and_____ought we to be so discouraged, even in despair.
A.in no time
B.by all means
C.by no means
D.in this case
我们都知道有些蛇有剧毒,那你知道毒性最强的是哪种吗?()
A.黄腹海蛇
B.内陆太攀蛇
C.蝰蛇