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1. New water-current patterns have brought more mixing of the Thalian Sea's shallow waters with nutrient-rich deeper waters. For coral and algae, both of which inhabit the shallow waters, growth rates depend principally on availability of nutrients and sufficient sunlight. The algae's rate of growth has increased, yet the coral's growth has slowed. Since algae can block sunlight from reaching coral below, the slowed coral growth is probably attributable to increased algae growth.
Which of the following, if true, most strengthens the argument?
A. The new water-current patterns in the Thalian Sea have increased the concentrations of industrial pollutants in its shallower parts.
B. In those areas of the Thalian Sea where there has been the greatest increase in algae growth, the growth of coral has stopped altogether.
C. In some areas of the Thalian Sea where shallow water receives abundant sunlight, there is no coral and there are only small amounts of algae.
D. Many of the nutrients essential to the growth of algae play no role in the growth of coral.
E. The mixing of the sea's shallow waters with nutrient-rich deeper waters is expected to diminish after this year.
2.A magazine invited readers to perform an experiment: have one friend sit blindfolded while another, seated behind the blindfolded person, peels a sticker off the magazine and then look either at or away from the blindfolded person on the basis of the instructions under the sticker. According to the responses received by the magazine, the blindfolded people, in a proportion greater than chance, correctly judge whether the person behind them was staring at them.
In order to evaluate the results of the experiment, which of the following would it be most important to establish?
A Whether the blindfolded person was generally told after the experiment was finished whether his or her answer had been correct?
B Whether the magazine published a time limit within which the experiment was to be conducted?
C Whether the peeling off of the sticker would have been audible to the blindfolded person?
D Whether the readers of the magazine sometimes fail to report results indicating an incorrect judgment by the blindfolded person?
E Whether inviting readers to take part in the experiment was intended to foster reader loyalty?
参考答案:
BD
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