(单选题)

Why does the author mention West Virginia in Paragraph 3?

A.To prove the place is unsuitable for human survival.

B.To stress planting trees is practical for clean air.

C.To indicate trees are difficult to live on such poor soil.

D.To show people in the state are now living a hard life.

参考答案：B

参考解析：

推理判断题。由题干中的 West Virginia 可将本题答案定位在文章第三段内。由其中前两句“The report explains that planting trees and overseeing forests are cost-effective ways to clean the air. They also work well across large areas.”可知，植树造林是划算的清理空气的方法。它们也适合大面积的使用。因此，本段中的举例是为证明用植树造林来清理空气是切实可行的。故选B。

知识点：阅读理解四选一英语专业基础知识阅读理解教师招聘-小学英语