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linlin的逻辑！谢谢！
陈向东
P96,10
proportionally, more persons diagnosed as having the brain disorder schizophrenia were born in the winter months than at any other time of year. A recent study suggests that the cause may have been the nutrient-poor diets of some expectant mothers during the coldest months of the year, when it was hardest for people to get, or afford, a variety of fresh foods.
which of the following, if true, helps to support the conclusion presented above?
a. over the years the number of cases of schizophrenia has not shown a correlation with degree of economic distress.
b. most of the development of brain areas affected in schizophrenia occurs during the last month of the mother's pregnancy.
c. suicide rates are significantly higher in winter than in any other season.
d. the nutrients in fresh foods have the same effects on the development of the brain as do the nutrients in preserved foods/
e. a sizable proportion of the patients involved in the study have a history of schizophrenia in the family.
答案：B
这道题的答案好像也只能选B了。可是我不明白B是如何与冬天食物少结合来支持营养不良是原因这个结论的呢？
P94,6
the plant called the scarlet gilia can have either red or white flowers. it had long been thought that hummingbirds, which forage by day, pollinate its red flowers and that hawkmoths, which forage at night, pollinate its white flowers. to try to show that this pattern of pollination by colors exists, scientists recently covered some scarlet gilia flowers only at night and others only by day: plants with red flowers covered at night became pollinated; plants with white flowers covered by day became pollinated.
which of the following, if true, would be additional evidence to suggest that hummingbirds are attracted to the red flowers and hawkmoths to the white flowers of the scarlet gilia?
a. uncovered scarlet gilia flowers , whether red or white, became pollinated at approximately equal rates.
b. some red flowers of the scarlet gilia that remained uncovered at all times never became pollinated.
c. white flowers of the scarlet gilia that were covered at night became pollinated with greater frequency than white flowers of the scarlet gilia that were left uncovered.
d. scarlet gilia plants with red flowers covered by day and scarlet gilia plants with white flowers covered at night remained unpollinated.
e. in late august, when most of the hummingbirds had migrated but hawkmoths were still plentiful, red scarlet gilia plants produced fruit more frequently than they had earlier in the season.
答案：D
我的问题是D是如何与题中的plants with red flowers covered at night became pollinated; plants with white flowers covered by day became pollinated.来支持结论：red flowers 仅吸引hummingbirds 而不吸引hawkmoths, white flowers 仅吸引hawkmoths而不吸引hummingbirds。
P92,2
for many people in the United states who are concerned about the cost of heating homes and businesses, wood has become an alternative energy source to coal, oil, and gas. nevertheless, wood will never supply more than a modest fraction of our continuing energy needs.
which of the following, if true, does not support the claim made in the last sentence in the passage above?
c. there are relatively narrow limits to how far wood can be trucked before it becomes more economical to burn the gasoline used for transportation instead of the wood.
e. most commercial users of energy are located within range of a wood supply, and two-thirds of United States homes are located outside of metropolitan areas.
答案：e
e 明白！不过我有个疑问是：C中有个时间状语在运输中燃烧气又要比燃烧木头更便宜之前，而文中并未提及这个时间状语，所以我认为这个选项有可能是加强也有可能是削弱啊！！
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发表于 2003-5-12 00:42:00
