题型分类:否定事实信息题
原文定位:定位词 Bt resistance in insect populations。利用定位词定位到文章第五段的第二句,并且之后全段都有提及,说明包含较多信息,我们利用排除法结合选项一一进行信息查找和排除,出现在文中并说法符合原文的选项排除掉,未提及或描述与原文不符的选项即为答案。
选项分析:
A 选项提到 so the use of Bt plants is probably safe as well,文中未说使用 Bt plants 是安全的。因此属于无中生有。
B 选项说如果转基因植物广泛使用的话,Bt-resistant insect 的进化最终将发生。对应第五段第一句。选项中 The evolution of Bt-resistant insect populations will happen eventually 对应第一句的 We know that evolution will occur。选项中 if use of transgenic plants becomes widespread 对应第一句的 when transgenic plants are grown on a large scale over a period of time 其中 widespread 对应 are grown on a large scale。
C 选项说因为 Bt plants 在所有的组织中一直是有毒的,所以它们只能使 Bt-resistant insects 存活并繁殖。对应第五段的第四句至第六句的信息。选项中 Because Bt plants are toxic at all times and in all tissues 对应第四句的 transgenic Bt plants express the toxin in all tissues throughout the growing season。选项中 they allow only Bt-resistant insects to survive and reproduce 对应第五句和第六句 Therefore, all insects carrying genes that make them susceptible to the toxin will die. That leaves only the genetically resistant insects alive to perpetuate the population。
D 选项说在 Bt plants 旁边种植非转基因植物可能帮助 Bt-susceptible insects 保留一部分。对应第五段的最后两句。选项中 Planting nontransgenic plants alongside Bt plants 对应倒数第二句 Farmers are attempting to slow the development of insect resistance in Bt crops by, for example, planting nontransgenic border rows。选项中 may help Bt-susceptible insects to remain part of the population 对应最后一句 to provide a refuge for susceptible insects. These insects may allow Bt susceptibility to remain in the population。
上一题
Official 38 Passage 2下一题
Official 37 Passage 1