66.
The sustained massive use of pesticides in farming has two effects that are especially pernicious. First, it often kills off the pests' natural enemies in the area. Second, it often unintentionally gives rise to insecticide-resistant pests, since those insects that survive a particular insecticide will be the ones most resistant to it, and they are the ones left to breed. From the passage above, it can be properly inferred that the effectiveness of the sustained massive use of pesticides can be extended by doing which of the following, assuming that each is a realistic possibility? (A) Using only chemically stable insecticides (B) Periodically switching the type of insecticide used (C) Gradually increasing the quantities of pesticides used (D) Leaving a few fields fallow every year (E) Breeding higher-yielding varieties of crop plants 请问这道题为什么选B呢? C为什么不对呢~~~~
67. Transnational cooperation among corporations is experiencing a modest renaissance among United States firms, even though projects undertaken by two or more corporations under a collaborative agreement are less profitable than projects undertaken by a single corporation. The advantage of transnational cooperation is that such joint international projects may allow United States firms to win foreign contracts that they would not otherwise be able to win. Which of the following is information provided by the passage? (A) Transnational cooperation involves projects too big for a single corporation to handle. (B) Transnational cooperation results in a pooling of resources leading to high-quality performance. (C) Transnational cooperation has in the past been both more common and less common than it is now among United States firms. (D) Joint projects between United States and foreign corporations are not profitable enough to be worth undertaking. (E) Joint projects between United States and foreign corporations benefit only those who commission the projects. 这道题中的"a modest renaissance"是解题点吗?谢谢!! |