— Let me help you carry the box.— No, thanks. It's big, __________ there is nothing in it.
A:and
B:so
C:but
D:because
We will write lots of e____ to each other.
种子萌发不需要的环境条件是( )
比一比,组词语。
画____ 由____
来____ 米____
甲、乙两同学站在滑板上相对而立,如图所示.当甲用60N的力推乙,甲静止不动,乙向后退,以下分析正确的是( )