求助Prep66&67

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

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.