山西重点中学协作体2015-2016学年高二下学期英语暑假作业12 WORD版含答案.doc
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1、山西重点中学协作体高二下学期英语暑假作业12专项篇之单词句子一、补全填空1、联系上下文,根据首字母填写单词。Every flu season it seems like were bombarded (炮轰,轰击) with commercials for new and improved medicines promising to relieve terrible headaches and f_1_. But for many people around the world, the secret to avoiding a nasty or even fatal cold might
2、lie in a better diet, not drugs. Researchers from the University of North Carolina at Chapel Hill, the Beltsville Human Nutrition Research Center in Maryland, and the Nestle Research Center in Switzerland have found that a deficiency of the mineral selenium (硒) may c_2_ to the spread of highly virul
3、ent strains of influenza virus.The team infected two g_3_ of miceone that had sufficient selenium in their diets and one that did not with a type of flu that also affects h_4_. The selenium-deficient mice were more l_5_ to get sick after being infected. More worrisome (令人不安的), the flu virus grew m_6
4、_ virulent when it re-emerged for the selenium-deficient mice.Random mutations (变异) normally alter the genes responsible f_7_ designing the proteins on the viruss surface. But in selenium-deficient mice, “its the exact opposite to what we expected,” says Beck, a researcher. The rapid mutation was in
5、stead occurring in genes that code for internal proteins. Those changes, she says, might reprogram the flu strain, making it more contagious (传染性的).Beck and her team are still uncertain exactly h_8_ selenium fits into the puzzle, but scientists know the mineral is necessary for antioxidant (抗氧化剂) ac
6、tivity in the body. without selenium, excess (过度的) free radicals wreak havoc (发泄,报仇) on the viral (滤过性病毒) RNA, leading to those unexpected mutations, says Beck.Common sources of selenium include breads, meats and fish, foods that Americans eat in abundance, says Orville Levander, a chemist at the Be
7、ltsville Nutrition Center. But Levander points out that some areas in China l_9_ selenium in the soil, and people who live there require selenium supplements to a_10_ health problems.2、用who, whom, which, whose, that填空,完成下面句子。11.Ellen was a painter of birds and of nature,had withdrawn(脱离) from the hu
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