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1. Science journalist: A study led by Dr. Elaine Hardman shows that consuming walnuts reduces the risk of breast cancer in at least some types of mice. The study compared the effects of a typical diet and a diet containing walnuts. During the study period, the group whose diet included walnuts developed breast cancer at less than half the rate of the typical-diet group. In addition, the number and sizes of tumors were significantly smaller.
Which of the following would, if true, most undermine the journalist's reasoning?
(A) The mice used in the study received the walnuts directly as food and indirectly through their mothers when they were in utero and while they were nursing.
(B) The amount of walnuts in the daily test diet equates to about two human servings of walnuts.
(C) Walnuts contain multiple ingredients that, individually, have been shown in other studies to reduce the risk of cancer or slow its growth.
(D) In the study’s mice, the walnut-containing diet changed the activity of multiple genes that are relevant to breast cancer in both mice and humans.
(E) To keep total dietary fat balanced in the mouse groups, unhealthy fats that lower resistance to disease were reduced by an amount equal to the amount of healthy fats added by the walnuts.
2. Which of the following most logically completes the argument?
Exposure to cold is the major killer of newborn lambs in Morland. Recently, garments to protect lambs from cold have become available. Although these garments cost less than the loss of a lamb, they're too expensive for Morland sheep farmers to purchase enough for all newborn lambs. However, purchasing garments for even a small percentage of their newborn lambs could significantly reduce the death rate, since only about 8% die of cold, and_______.
A The average income of Morland sheep farmers has remained fairly steady in recent years.
B Newborn lambs on sheep farms are seldom kept in heated barns.
C The lambs at risk from cold are those below a certain critical weight at birth.
D Lambs that survive exposure to extreme cold typically bring a lower market price the lambs that were never exposed to extreme cold.
E Few adult sheep die of exposure to cold.
参考答案：
EC
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发表于 2021-6-24 12:16:42
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