He told me that the earth ____ around the sun. ( )
A:went
B:had gone
C:goes
D:have gone
如图所示,∠BAD=____+____,∠AOC=____+____,我们也把∠AOC叫做____角.
The sun in the morning.
关于动物细胞培养的叙述错误的是
黄河“地上河”的河段是指