B) is but a short-term relief to the food problem.
C) can hardly alleviate the shortage of food.
D) proves to be an effective way out for impoverished nations.
注:对应文章第二段。Short-term对应temporarily,relief对应avoid。
39.Amonghumanitys current problems , the chief concern of the scientists is _______.
A) the impoverishment of developing countries.
B) the explosion of the human population.
C) the reduction of biological diversity.
D) the effect of global warming.
注:第三段。C选项中reduction对应rob,diversity对应richness。
40.The authors purpose in writing this passage is ________.
A) to describe the difficulties in solving humanitys current problems.
B) to present the different views on humanitys current problems.
C) to analyze the contradiction between countries in dealing with humanitys current problems.
D) to point out that humanitys current problems can only be solved through the cooperation of nations.
注:看最后一句话,cooperation of nations 对应coordinated international efforts。
[Page80]
We sometimes think humans are uniquely vulnerable to anxiety, but stress seems to affect the immune defenses of lower animals too. In one experiment, for example, behavioral immunologist Mark Laudenslger, at the University of Denver, gave mild electric shocks to 24 rats. Half the animals could switch off the current by turning a wheel in their enclosure, while the other half could mot. The rats in the two groups were paired so that each time one rat turned the wheel it protected both itself and its helpless partner from the shock. Laudenslager found that the immune response was depressed below normal in the helpless rats but not in those that could turn off the electricity. What he has demonstrated, he believes, is that lack of control over an event, not the experience itself, is what weakens the immune system.
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