– People all over the world do something good for the earth on April 22nd –– Earth Day.– Well. ______ what we should do is to make every day Earth Day.
A:And
B:So
C:But
下列选项中属于我国弱势群体主体的是( )
右图是a、b两种固体物质的溶解度曲线,下列说法中,正确的是()
下列物质属于氧化物的是( )