英语单选集考.试卷模拟考试题_3

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、despite the fact that today viruses (病毒) are known to cause cancer in animals and in certain plants, there exists a great reluctance to accept viruses as being of importance in human cancer. basic bio

2、logical phenomena generally do not differ strikingly as one goes from one species to another. it should be recognized that cancer is a biological problem and not a problem that is unique for man. cancer originates when a normal cell suddenly becomes a cancer cell which multiplies widely and without

3、apparent restraint. cancer may originate in many different kinds of cell, but the cancer cell usually continues to carry certain traits (特性) of the cell of origin. the transformation of a normal cell into a cancer cell may have more than one kind of cause, but them is good reason to consider the rel

4、ationships that exist between viruses and cancer.since there is no evidence that human cancer, as generally experienced, is infections, many persons believe that because viruses are infections agents they cannot possibly be of importance in human cancer. however, viruses can mutate (突变) and examples

5、 are known in which a virus that never kills its host can mutate to form a new strain of virus that always kills its host. it does not seem unreasonable to assume that an innocuous (无害的) latent (潜伏的) virus might mutate to form a strain that causes cancer. certainly the experimental evidence now avai

6、lable is consistent with the idea that viruses as we know them today, could be the causative (引起的) agents of most, if not all cancer, including cancer in man.cancer should be considered to be a biological problem rather than a medical one because _. （ ）a.viruses are known to cause cancer in animalsb

7、.at present, human cancer is not believed to be contagious (传染的)c.there are many known causes for the transformation of a normal cell to a cancer celld.results of experiments on plants and animals do not vary greatly from species tn species2、despite the fact that today viruses (病毒) are known to caus

8、e cancer in animals and in certain plants, there exists a great reluctance to accept viruses as being of importance in human cancer. basic biological phenomena generally do not differ strikingly as one goes from one species to another. it should be recognized that cancer is a biological problem and

9、not a problem that is unique for man. cancer originates when a normal cell suddenly becomes a cancer cell which multiplies widely and without apparent restraint. cancer may originate in many different kinds of cell, but the cancer cell usually continues to carry certain traits (特性) of the cell of or

10、igin. the transformation of a normal cell into a cancer cell may have more than one kind of cause, but them is good reason to consider the relationships that exist between viruses and cancer.since there is no evidence that human cancer, as generally experienced, is infections, many persons believe t

11、hat because viruses are infections agents they cannot possibly be of importance in human cancer. however, viruses can mutate (突变) and examples are known in which a virus that never kills its host can mutate to form a new strain of virus that always kills its host. it does not seem unreasonable to as

12、sume that an innocuous (无害的) latent (潜伏的) virus might mutate to form a strain that causes cancer. certainly the experimental evidence now available is consistent with the idea that viruses as we know them today, could be the causative (引起的) agents of most, if not all cancer, including cancer in man.

13、the possibility that a virus causes human cancer is indicated by _. （ ）a.the fact that viruses have been known to mutateb.the fact that a cancer-immune individual may lose his immunityc.the fact that production of human cancer cells might be due to a genetic factord.the fact that man is host to many

14、 viruses3、despite the fact that today viruses (病毒) are known to cause cancer in animals and in certain plants, there exists a great reluctance to accept viruses as being of importance in human cancer. basic biological phenomena generally do not differ strikingly as one goes from one species to anoth

15、er. it should be recognized that cancer is a biological problem and not a problem that is unique for man. cancer originates when a normal cell suddenly becomes a cancer cell which multiplies widely and without apparent restraint. cancer may originate in many different kinds of cell, but the cancer c

16、ell usually continues to carry certain traits (特性) of the cell of origin. the transformation of a normal cell into a cancer cell may have more than one kind of cause, but them is good reason to consider the relationships that exist between viruses and cancer.since there is no evidence that human can

17、cer, as generally experienced, is infections, many persons believe that because viruses are infections agents they cannot possibly be of importance in human cancer. however, viruses can mutate (突变) and examples are known in which a virus that never kills its host can mutate to form a new strain of v

18、irus that always kills its host. it does not seem unreasonable to assume that an innocuous (无害的) latent (潜伏的) virus might mutate to form a strain that causes cancer. certainly the experimental evidence now available is consistent with the idea that viruses as we know them today, could be the causati

19、ve (引起的) agents of most, if not all cancer, including cancer in man.many people believe that viruses cannot possibly be of importance in human cancer because _. （ ）a.they are innocuous agenciesb.they are the causative agents of most human cancerc.they seem to be infections to many peopled.they are g

20、enerally thought to be relevant to most cancer in man4、despite the fact that today viruses (病毒) are known to cause cancer in animals and in certain plants, there exists a great reluctance to accept viruses as being of importance in human cancer. basic biological phenomena generally do not differ str

21、ikingly as one goes from one species to another. it should be recognized that cancer is a biological problem and not a problem that is unique for man. cancer originates when a normal cell suddenly becomes a cancer cell which multiplies widely and without apparent restraint. cancer may originate in m

22、any different kinds of cell, but the cancer cell usually continues to carry certain traits (特性) of the cell of origin. the transformation of a normal cell into a cancer cell may have more than one kind of cause, but them is good reason to consider the relationships that exist between viruses and cancer.since there is no evidence that human cancer, as generally experienced, is infections, many persons believe that because viruses are infe