A:①②③
B:②③④
C:①③⑤
D:②③⑤
— Bob, shall we go and meet our new classmate?
— Sorry, I'm busy now. But you ________ ask David to go with you. He is free.
解决我国水资源不足的途径中,我们中学生能积极直接参与的是( )
连线成词。
旅____ 察
降____ 荚
山____ 洼
豆____ 落
观____ 行