C．result in the inactiveness of the mosquitoes' receptors

　　D．make the mosquitoes uninterested in human breath and skin smell

　　7．Through the passage, the writer aims to________.

　　A．inform readers of the new development in fighting mosquitoes　

　　B．praise the achievements made in the battle against malaria　

　　C．introduce a cheaper product in fighting mosquitoes

　　D．tell the differences between Ethyl pyruvate and DEET

　　8．This passage most probably appears in________.

　　A．the column of newspaper ads

　　B．the health column of a magazine

　　C．a textbook of medical schools

　　D．a collection of doctors' essays

　　(三)

　　A hug from someone you love gives warmth and comfort. They are familiar feelings that we sometimes forget about, and few of us realize that our lives depend on our sense of touch. Touch is the first sense babies develop while in their mother's womb(子宫). In fact, it is the memory of being surrounded by warm liquid that makes babies want to be held or wrapped in soft blankets. Like all our senses, touch depends on a special organ. Other sense organs, like eyes, ears, nose and mouth, are located in one place. But the touch organ is the skin, our biggest organ, which stretches over our whole body.

　　However, our sense of touch does more than just tell us if something is soft, hard, rough or smooth. It helps keep us from danger. Imagine relying on your sense of smell to tell you that your hand is burning on a hot pan!

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