英语单选集考试卷模拟.考试题_2

1、姓名：_ 班级：_ 学号：_-密-封 -线- 英语单选集考试卷模拟.考试题考试时间：120分钟 考试总分：100分题号一二三四五总分分数遵守考场纪律，维护知识尊严，杜绝违纪行为，确保考试结果公正。1、since the early 1980s, scientists have revealed some 40 human genes involved in cancer. these genes are essential for normal growth, but can be subverted to cause a tumor.dr. jorge yunis of the univer

2、sity of minnesota medical school in minneapolis has found that 70 percent of oncogenes, or cancer-causing genes, are located near inherited weak points on chromosomes(染色体). varying from individual to individual, vulnerable to chemical carcinogens(致癌剂) ,x rays and other cancer-inducing agents.“if a c

3、hromosome snaps apart in the immediate vicinity of an oncogene,” says yunis, “normal genetic control mechanisms could break down and the stage would be set for the formation of cancer.” younis hag shown that such a sequence occurs at the beginning of numerous leukemias (白血病), lymphomas (淋巴瘤) and som

4、e tumors of the lung, colon (结肠) and breast.yunis and other investigators have found that petroleum-based products-notably pesticides and insecticides-damage specific sites on at least two of the 23 pairs of human chromosomes that carry genetic information. similarly, tobacco smoke tends to attack a

5、 part of another chromosome.from paragraph 1, we know that some 40 genes involving in cancer are _. （ ）a.harmful to the human bodyb.necessary to the human bodyc.the elements that form cancerd.useless to the human body2、since the early 1980s, scientists have revealed some 40 human genes involved in c

6、ancer. these genes are essential for normal growth, but can be subverted to cause a tumor.dr. jorge yunis of the university of minnesota medical school in minneapolis has found that 70 percent of oncogenes, or cancer-causing genes, are located near inherited weak points on chromosomes(染色体). varying

7、from individual to individual, vulnerable to chemical carcinogens(致癌剂) ,x rays and other cancer-inducing agents.“if a chromosome snaps apart in the immediate vicinity of an oncogene,” says yunis, “normal genetic control mechanisms could break down and the stage would be set for the formation of canc

8、er.” younis hag shown that such a sequence occurs at the beginning of numerous leukemias (白血病), lymphomas (淋巴瘤) and some tumors of the lung, colon (结肠) and breast.yunis and other investigators have found that petroleum-based products-notably pesticides and insecticides-damage specific sites on at le

9、ast two of the 23 pairs of human chromosomes that carry genetic information. similarly, tobacco smoke tends to attack a part of another chromosome.where are most likely to be affected by caner-inducing agents according to the passage （ ）a.the lung.b.the colon.c.the chromosomes.d.the breast.3、since t

10、he early 1980s, scientists have revealed some 40 human genes involved in cancer. these genes are essential for normal growth, but can be subverted to cause a tumor.dr. jorge yunis of the university of minnesota medical school in minneapolis has found that 70 percent of oncogenes, or cancer-causing g

11、enes, are located near inherited weak points on chromosomes(染色体). varying from individual to individual, vulnerable to chemical carcinogens(致癌剂) ,x rays and other cancer-inducing agents.“if a chromosome snaps apart in the immediate vicinity of an oncogene,” says yunis, “normal genetic control mechan

12、isms could break down and the stage would be set for the formation of cancer.” younis hag shown that such a sequence occurs at the beginning of numerous leukemias (白血病), lymphomas (淋巴瘤) and some tumors of the lung, colon (结肠) and breast.yunis and other investigators have found that petroleum-based p

13、roducts-notably pesticides and insecticides-damage specific sites on at least two of the 23 pairs of human chromosomes that carry genetic information. similarly, tobacco smoke tends to attack a part of another chromosome.according to the context, the word in “oncogenes” in par （ ）a.a2 means _. genes

14、 that can kill cancer genes that will lead to leukemia viruses that can kill aids genes that will lead to cancer4、since the early 1980s, scientists have revealed some 40 human genes involved in cancer. these genes are essential for normal growth, but can be subverted to cause a tumor.dr. jorge yunis

15、 of the university of minnesota medical school in minneapolis has found that 70 percent of oncogenes, or cancer-causing genes, are located near inherited weak points on chromosomes(染色体). varying from individual to individual, vulnerable to chemical carcinogens(致癌剂) ,x rays and other cancer-inducing

16、agents.“if a chromosome snaps apart in the immediate vicinity of an oncogene,” says yunis, “normal genetic control mechanisms could break down and the stage would be set for the formation of cancer.” younis hag shown that such a sequence occurs at the beginning of numerous leukemias (白血病), lymphomas

17、 (淋巴瘤) and some tumors of the lung, colon (结肠) and breast.yunis and other investigators have found that petroleum-based products-notably pesticides and insecticides-damage specific sites on at least two of the 23 pairs of human chromosomes that carry genetic information. similarly, tobacco smoke tends to attack a part of another chromosome.under what conditions will the formation of cancer b