10. 每隔几年

11. 富含矿物质__________________

12. 防止风和水带走土壤

13. 保持土壤肥沃____________________

14. 有同样的目标

15. 避免破坏环境和危害健康

【答案】略

Step2: Sentence patterns

1. Recently, however, scientists have been finding that long-term use of these fertilizers can cause damage to the land and, even more dangerous, to people's health.

然而，最近科学家发现长期使用这些化肥会造成土地受损，甚至更危险的是，会对人们的健康造成危害。

It has been raining for many days. 雨已经下了好多天了。

I have been learning English since five years ago.自从五年前以来我一直在学英语。

have/has been doing是________________时，意思是_______________________________, 表示一个动作从过去某个时候开始一直持续到现在，还有可能继续持续下去。

[实战演练]

1).I won't tell the student the answer to the maths problem until he it for more than an hour. (work) 我不会告诉那个学生答案直到他计算了一个小时后。

2).Jane's eyes are red. She . (cry)简的眼睛是红的。她一直在哭。

【答案】现在完成进行时； 一直做，总是做 1）have been working on 2 has been crying all the time

[句法分析] making it ready for crops 为现在分词作 ；that need rich and fertile soil为 从句，修饰 。

[实战演练]