A:She is a worker.
B:She works in a factory.
— Would you like to go for a picnic with me?
— ______ I have to help Kate with her Chinese
读“某国人口自然增长率变化曲线图”完成下题.
水被污染后会给人类带来灾难,为了防止水污染,可采用的方式是 ( )