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8英语试题)
alternatives. The compounds responsible for nice smellof lavender（燕衣草）,known as essentialoils,have long been shown to drive away mosquitoes.mosquito-repellent cloth that can be fashioned into outerwear.The researchers created a solution (溶液） of silk fibroin and gum Arabic, a substance usedto help the materials form into stable structures. The solution was stirred continuously at warmtemperatures as lavender oil and water were added. Under these conditions, the silk fibroin andgum Arabic formed into tiny oil-containing capsules. When the solution was cooled, the stirringstopped and other important ingredients were added, the(capsules sank to the bottom forcollection.They then tied many thousands of these capsules to pieces of cotton cloth. Keen to see ifthe cloth would drive mosquitoes away, Dr. Tariq and Dr. Wang turned it into arm-length gloves.Then three volunteers repeatedly put gloved arms into containers full of starving mosquitoes forfive minutes at a time. The researchers noted how many of the mosquitoes landed on thevolunteers’ arms during each trial. As a control, each volunteer was also asked to wear a gloveJt's reported that an average of 15 mosquitoes landed on each controlwith no lavender capsules.glove, the average landing on each scented (有香味的) arm was less than one.therefore, threw the gloves into ordinary washing machines and repeated the trials. Even after 40washes, an average of only 2.5 mosquitoes landed on the 15% gloves during trials. Success hasrarely smelled sweeter.28. What makes lavender oil an alternative to artificial repellents?D.Cost.C. Color.B.Safety.A.8mell.29. What is Paragraph 3 mainly about?A. The formation of lavender oil capsulesC. The collection of oil-containing capsules..The benefits of silk fibroin and gum Arabic.英语试题第6页（共12页）
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