—You are right.
A:appear quickly
B:disappear completely
C:stay healthy
地球自转产生的现象是( )
What do you want _____ drink? ( )
一定条件下分别分解高锰酸钾、氯酸钾、过氧化氢三种物质,都可以得到氧气。这说明三种物质的组成中都含有()