7．解析：选A　细节理解题。根据倒数第二段中的“Images can be downloaded free of charge, meaning companies can then use them to help deliver data to farmers on soil conditions or pest infestation”可知，哥白尼项目可通过提供关于土壤状况或害虫侵扰的数据来帮助农民。

　　8．解析：选D　段落大意题。最后一段主要介绍了Sentinel­1A 将与以后发射的卫星一起工作，因此该段主要介绍了该卫星的未来，应选择D。

　　Ⅲ.参考范文：

　　Dear Helen，

　　Thank you for your email. Now I would like to tell you something about the extra­curricular reading in our school. I'm sorry to say that most of the students in our school haven't realized the importance of reading, especially extra­curricular reading. As a result, the time and energy students devoted to reading are very limited. Besides, some students prefer to read cartoons, magazines and newspapers rather than classic reading materials.

　　I think the reasons behind that are various. First of all, quite a lot of students are burdened with too much homework. Still others haven't formed a habit of reading. They would rather spend their spare time on TVs or on computers.

　　However, reading has many benefits. Through reading we can learn more about the world. Reading can help us think better and make our life more colorful. So it is quite necessary

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