Every year thousands of trees _________ to improve the environment.
A:were planted
B:are planted
C:have planted
D:will plant
关于欧洲西部位置的叙述,错误的是( )
读某节气某半球近地面风带分布模式图,回答下列各题。
quantities of, on average, on behalf of, in existence, on the whole, in panic, in appreciation of, be apposed of, decide on, in spite of
下列能调节青少年情绪,保持愉快心情的是( )
俄国十月革命具有划时代的意义。十月革命( )