M5U5 限时训练.doc

M5U5 限时训练出题人:luminghuo 班级: 姓名： 一，单词拼写，根据所给的首字母完成句子1，Perseverance(毅力) is an e_ quality required on ones way to success.2, The sprain made my ankle s_ up.3, He fell down onto the ground as he was cleaning the window, and whats more, he sprained his w_. 4, After the match, the chairman p_ gold medals to the champions.5, You can never depend on him. What he lacks is s_ of responsibility.6, Third degree burns damage not only all three layers of the skin but also any t_ and organs under the skin.7, Those blackmailers (勒索者) intended to s_ more money out of him.8, He s_ his ankle while playing basketball and now hes still in great pain.9, Dont feed beans to the baby. He may get c_. 10, The shoes are too tight and my feet begin to b_. 二，完成句子1， (采取急救措施) quickly will save ones life. 2, clothing (脱掉) the burned area unless it _ _ _ (粘贴)the burn. 3, _ _ in this street _ I met one of my friend.(强调句)4，_ _ _ _ (今老师吃惊的)，he did better in his first aid exam than expected. 5, We decorate the house _ _ (根据) the taste of its owner. 三，完形填空I am always eager to do experiments, especially chemistry ones. Its 11 to work with test tubes and beakers , even though sometimes my efforts end in failure. Experiments were fun for me 12 a recent accident. The accident happened when I was heating a big test tube with an alcohol burner , chatting to my partner. All of a sudden, the tube cracked. Even though I jumped from my seat when I heard the crack, the hair on my forehead was burnt as I was leaning too close to the test tube. 13 I had no time to be sad about my hair: the liquid in the test tube poured onto the table and caught fire. Id never 14 anything so bad! My mind went blank for a moment. Then I quickly covered the fire with a damp cloth to put it out. The teacher told me that the test tube broke in half at the bottom because we didnt dry it properly before 15 it. We calmed down and did the experiment, again. But our hearts were still 16 rapidly even after we walked out of the lab. But my bad luck didnt end there! Since all our 17 was focused on the flames while we were in the lab, I didnt see the liquid falling onto my trousers. During the following class, I felt a pain in my leg. Soon it became more and m6re painful and I touched the area with my fingers, 18 to make things better. But to my great 19 , the material of my trousers turned into powder! Vitriol ! ! ! The terrible word came into my mind. I rushed out right away to wash and examine my poor skin. 20 , it was not a serious injury. After changing my trousers I thought its very important to have a serious attitude in chemistry class. Doing scientific experiments as a learner is no laughing matter.11. A. exciting B. moving C. dangerous D. difficult12. A. but B. except C. besides D. until13. A. Because B. Instead C. But D. Or14. A. felt B. heard C. experienced D. imagined15. A. boiling B. holding C. heating D. cooking16. A. striking B. beating C. knocking D. hitting17. A. effort B. sense C. attention D. spirit18. A. failing B imaging C. trying D. planning19. A. disappointment B. joy C. surprise D. comfort20. A. Luckily B. Obviously C. Unexpectedly D. Generally四，阅读理解Can people change their skin color without suffering like pop king Michael Jackson? Perhaps yes. Scientists have found the gene that determines skin color.The gene comes in two versions, one of which is found in 99 per cent of Europeans. The other is found in 93 to 100 per cent of Africans, researchers at Pennsylvania State University report in the latest issue of Science.Scientists have changed the color of a dark-striped zebra fish to uniform gold by inserting a version of the pigment(色素) gene into a young fish. As with humans, zebra fish skin color is determined by pigment cells, which contain melanosomes(黑色素). The number, size and darkness of melanosomes per pigment cell determine skin color.It appears that, like the golden zebrafish, light-skinned Europeans also have a mutation(变异) in the gene for melanosome production. This results in less pigmented skin.However, Keith Cheng, leader of the research team, points out that the mutation is different in human and zebra fish genes.Humans acquired dark skin in Africa about 1.5 million years ago to protect bodies from ultraviolet rays of the sun(太阳光紫外线), which can cause skin cancer.But when modern humans leave Africa to live in northern latitudes, they need more sunlight on their skin to produce vitamin D. So the related gene changes, according to Cheng.Asians have the same version of the gene as Africans, so they probably acquired their light skin through the action of some other gene that affects skin color, said Cheng.The new discovery could lead to medical treatments for skin cancer. It also could lead to research into ways to change skin color without damaging it like chemical treatment did on Michael Jackson.51. The passage mainly tells us that _. A. people can not change their skin color without any pain B. the new discovery could lead to search into ways to change skin color safely C. pop king Michael Jackson often changed his skin color as he liked D. scientists have found out that peoples skin color is determined by the gene52. It can be inferred from the passage that _. A. nowadays people who want to change their skin color have to suffer a lot from the damage caused by the chemical treatment B. Europeans and Africans have the same gene C. the new discovery could help to find medical treatments for skin cancer D. there are two kinds of genes53. Scientists have done an experiment on a dark-striped zebrafish in order to _. A. find the different genes of humans B. prove the humans skin color is determined by the pigment gene C. find out the reason why the Africans skin color is dark D. find out the ways of changing peoples skin color54. The reason why Europeans are light-skinned is probably that _. A. they are born light-skinned people B. light-skinned Europeans have mutation in the gen for melanosome production C. they have fe