土壤盐基饱和度
参考答案：就是指土壤中各种交换性盐基离子的总量占阳离子交换量的百分数。
用所给动词的适当形式填空。
1. Look! Stephen ______ (lie) on the bunk bed.
2. Lily, ______ (look) out of the window. There is a lovely dog.
3. Everyone in our family ______ (like) to watch Lucky 52.
4. It's important______ (not play) with fire.
5. They live a comfortable life and have nothing ______ (worry) about.
