7. What does the underlined word "release" in Paragraph 3 mean?

　　A. turn out.

　　B. break out.

　　C. leave out.

　　D. let out.

　　8. The best title for this text might be _____•

　　A. The Ring of Tiny Frogs in Spring

　　B. The Relationship between Animals and Seasons

　　C. The Living Conditions of Spring Peepers

　　D. The Invitation from a Male Peeper

　　【参考答案】5—8、BCDA

　　【云南省昆明市2017一模试卷】C

　　Windbreaks are barriers ( 屏障) formed by trees and other plants. Farmers plant these barriers around their fields, which help prevent the loss of soil, stop the wind from blowing soil away. They also keep the wind from damaging or destroying crops. Besides, extra trees and plants can be cut down and used or sold for wood.

　　Windbreaks can be highly valuable for protecting grain crops. For example, in parts of West Africa grain harvests were as much as twenty percent higher in fields protected by windbreaks compared to fields without them.

　　But here is something interesting about windbreaks. They seem to work best when they allow some wind to pass through the barrier of trees or plants around a field. If not, then the movement of air close to the ground will lift the soil. Then the soil will be blown away. For this reason, a windbreak works best if it contains only 60 to 80 percent of the trees and plants that would be needed to make a solid line. An easy rule to remember is that windbreaks can protect areas up to 10 times the height of the tallest trees in the windbreak.

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