河沙
参考答案：
从淡水湖中或山区浅沟中挖来的沙，一般不带盐碱性，可拌入土中种植花卉，或作为扦插的介质。
If you try to sit on two chairs，you will fall them For life，you must
choose one chair．
A between B under C among D into
三自宣言
