根构型与养分吸收
参考答案：
不同植物具有不同的根构型，浅根系由于其在表层的根相对较多而更有利于对表层养分的吸收；深根系则相反。
根据句意及所给汉语提示完成单词。
1. The old woman is crying______(悲伤). What happened to her?
2. I’ve______(刚刚) known it. Sorry to hear that.
3. Kitty got______(结婚) last year. Her husband is a computer programmer.
4. The plane ______(降落) at six this morning. Everything was OK.
5. How many ______(街区) are there in your hometown?
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