A:影响农作物的传粉
B:增加农作物的病害
C:破坏生态平衡
D:影响农作物种子的传播
Twenty students want to attend the class that aims to teach to read first.
中国要发展,要壮大,就必须坚持对外开放。我国对外开放的根本基点是( )