—What did our geography teacher say?—She told us that the earth _____ around the sun.
A:moves
B:moved
C:has moved
D:was moving
水样 →加絮凝剂 沉降→过滤→吸附 →加消毒剂 自来水
下列有关人体激素的叙述正确的是( )
下列现象是由于光的反射形成的是( )
This toy be Amy's. She is the only kid at the picnic.