Question

【题目】The children planted more trees and flowers after they ________ Greener China.

A. joined B. took part

C. joined on D. became

Answer 1

【答案】A

【解析】句意：孩子们加入了绿色中国组织后，种下了更多的树和花。考查动词（短语）辨析题。become成为（一员），后接a member of，可排除。take part in指参加某一活动并发挥作用；join既可指参加一群人的活动，也指加入某个组织。Greener China绿色中国组织，根据句意语境，可知选A。