请教GWD10两道逻辑题

Which of the following most logically completes the passage?

A certain tropical island received food donations in the form of powdered milk for

distribution to its poorest residents, who were thought to be malnourished. Subsequently,

the rate of liver cancers among those islanders increased sharply. The donated milk was

probably to blame: recent laboratory research on rats has shown that rats briefly exposed

to the substances aflatoxin tend to develop liver cancer when fed casein, a milk protein.

This result is relevant because _______.

A. in the tropics, peanuts, a staple of these island residents, support a mold growth

that produces aflatoxin

B. the liver is more sensitive to carcinogens, of which aflatoxin may be one, than

most other bodily organs

C. casein is not the only protein contained in milk

D. powdered milk is the most appropriate form in which to send milk to a tropical

destination

E. the people who were given the donated milk had been screened for their ability to

digest milk

我选的是B，感觉A怪怪的

Q40:

Insect infestations in certain cotton-growing regions of the world have caused dramatic

increases in the price of cotton on the world market. By contrast, the price of soybeans

has long remained stable. Knowing that cotton plants mature quickly, many soybean

growers in Ortovia plan to cease growing soybeans and begin raising cotton instead,

thereby taking advantage of the high price of cotton to increase their income significantly,

at least over the next several years.

Which of the following, if true, most seriously weakens the plan’s chances for success?

A. The cost of raising soybeans has increased significantly over the past several

years and is expected to continue to climb.

B. Tests of a newly developed, inexpensive pesticide have shown it to be both

environmentally safe and effective against the insects that have infested cotton

crops.

C. In the past several years, there has been no sharp increase in the demand for

cotton and for goods made out of cotton.

D. Few consumers would be willing to pay significantly higher prices for cotton

goods than they are now paying.

E. The species of insect that has infested cotton plants has never been known to

attack soybean plants.

为什么D不对呢？

多谢各位指教啊