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1、广东省2012届高三英语二轮复习专题训练：阅读理解（21）阅读下列短文，从每题所给的A.B.C和D项中，选出最佳选项，并在答题卡上将该项涂黑。AMany years ago my student asked me the question, Mrs. Kindred, why do you teach? Without taking time to reflect, I answered, Because someday I might say something that might make a difference in someones life. Even though I was
2、sincere, that wasnt a very good answer and my student didnt let it slide. Let me get this straight, he said, You went to college for four years so you could come here every day because you have the hope that someday you might say something that will influence someone? He shook his head as if I were
3、crazy and walked away looking confused. Im one of those people who look back and wish they had said something smart or witty, or swift. Even though that particular student might no longer wonder why I teach, there are days when I wonder. On those days, I remind myself of the real reasons I teach: It
4、s in my blood. My mother was my most influential teacher, and she was a 6th grade reading teacher until her death in 1990. She instilled (逐渐灌输) in me a love of reading and the knowledge that education opens doors. Teaching is a way to make a difference. If you throw a stone in a pond the ripples go
5、on and on until they reach the shore. You cant have ripples without a stone. Good teachers throw stones that make a positive difference, and thats what I try to do. I genuinely love teenagers. I want to share with others what I know and what I have learned through the years. Life is full of ups and
6、downs, and if I can help students avoid some potholes on the road of life, I want to do so. If theyll allow me to celebrate their victories with them, I want to do too. Teaching isnt for everyone, but I know I made the right career choice.1. Why did the student continue to ask the question about the
7、 writers being a teacher? A. Because he thought her answer was unbelievable. B. Because the writer was insincere. C. Because the student was naughty. D. Because the answer was difficult to understand.2. What do you think of the writer? A. Stupid. B. Honest. C. Conservative （保守的）. D. Polite.3. Accord
8、ing to the text, which of the following is NOT true? A. The writers mother has the greatest influence on her. B. The writers answer made the student confused. C. In the writers opinion, some people in the world are unfit to teach. D. The writer annoyed the student who asked the question.4. We can in
9、fer from the text that _. A. the writer was also a good teacher in school B. the writer often plays with her students beside a pond C. the writer devotes herself to teaching and her students D. the writer often accompanies the students on their way home5. Whats the main idea of the text? A. A studen
10、ts silly question. B. A good teacher who likes students. C. A confused student. D. The reason why I teach.BCan 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
11、 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 zebrafish（斑马鱼） to uniform gold by inserting a version of the pigme
12、nt (色素) gene into a young fish. As with humans, zebrafish skin color is determined by pigment cells, which contain melanin (黑色素). The number, size and darkness of melanin per pigment cell determine skin color.It appears that, like the golden zebrafish, light-skinned Europeans also have a mutation (变
13、异) in the gene for melanin 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 zebrafish genes.Humans acquired dark skin in Africa about 1.5 million years ago to protect bodies from ultra-violet ray
14、s 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 acq
15、uired 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.6. The
16、 passage mainly tells us that _. A. people can not change their skin color without any pain B. the new discovery could lead to research 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 gene7. It can
