2014年5月25日托福阅读真题P3+题目+答案：Pest Control

2014年5月25日托福阅读真题P3+题目+答案：Pest Control

Many pest species that are native to North America, such as white-footed mice and ground moles, are more nuisance pests and are usually regulated by native predators and parasites. This situation is not true for nonindigenous pests in North America, such as brown rats and cockroaches. After centuries, it is evident that these pests cannot be eradicated. The best that can be done is to introduce pest control measures that will control their numbers.

1. The word ”evident” in the passage is closet in meaning to

A.surprising

B.obvious

C.believed

D.frustrating

2. What can be inferred from paragraph 1 about nonindigenous pests such as brown rats and cockroaches?

A.Attempts limit the size of their populations have been unsuccessful.

B.They have inhabited North America longer than white-footed mice and ground moles.

C.Their numbers cannot usually be controlled by native predators and parasites.

D.They do not pose as many problems for humans as do white-footed mice and ground moles.

And ancient and popular means of pest control is chemical. For example, the Sumerians used sulfur to combat crop pests, and by the early 1800s such chemicals as arsenic were used to combat insect and fungal pests.

However, chemical control has its dark side. Chemical pesticides have many unintended consequences through their effects not just on the target species but on a wide array of nontarget species as well, often eliminating them and thereby upsetting the existing food webs, especially through the suppression of native predator species. The surviving pests then rebound in greater numbers than ever.

3. Which of the sentences below best expresses the essential information in the highlighted sentence in the passage? Incorrect choices change the meaning in important ways or leave out essential information.

A.Chemical pesticides often eliminate species other than the intended target and thereby upset food webs, especially by suppressing native predator species.

B.Native predator species are often eliminated by chemical pesticides that are intended to have consequences for other pests.

C.Chemical pesticides upset existing food webs by eliminating native species and by increasing the number of nonnative predators.

D.The effects of chemical pesticides on a wide array of food webs and native predators are often unintended.

Perhaps more insidious is that a pesticide loses its effectiveness because the target species evolves resistance to it. As one pesticide replaces another, the pests acquire a resistance to them all. Some species, notably certain mosquitoes, have overcome the toxic effects of every pesticide to which they have been exposed. Insect pests need not only about five years to evolve pesticide resistance, their predators do so much more slowly. So after the pest develops resistance, pest outbreaks become even more disastrous.

.。。。。。此处省略部分原文及题目！

2014年5月25日托福阅读真题P3+题目+答案：Pest Control，完整版下载，10元有偿！