[填空题]Pollution is said to _____ many people to suffer from cancer.

[单项选择] Air Pollution When people think about air pollution, they usually think about smog, acid rain, CFC’’s, and other forms of outdoor air pollution. But did you know that air pollution also can exist inside homes and other buildings It can, and every year, the health of many people is affected by chemical substances present in the air within buildings. A great deal of research on pollution is being conducted at laboratories and universities. The goals of the research are to find solutions and to educate the public about the problem. Two places where this type of work is being done are LBNL and the University of California, Berkeley. Let’’s take a closer look at the various types of air pollution, the effects that they have on people, and what is being (or not being) done to correct the problem. What Is Air Pollution Air is the ocean we breathe. Air supplies us with oxygen which is essential for our bodies to live. Air supplies us with o
A. Y
B. N
C. NG

[单项选择]Many pregnant women suffer from vitamin deficiency, but this is frequently not due to vitamin deficiency in their diets; most often it is because they have higher requirements for vitamins than do the rest of the population.
The best criticism of the reasoning in the statement above is that it
A. fails to specify the percentage of pregnant women who suffer from vitamin deficiency.
B. gives insufficient information about why pregnant women have higher vitamin requirements than do other groups.
C. fails to employ the same reference group for both uses of the term "vitamin deficiency. "
D. provides insufficient information about the incidence of vitamin deficiency in other groups with high vitamin requirements.
E. (E) uses "higher requirements" in an ambiguous manner.

[单项选择]Many institutions of higher education suffer declining enrollments during periods of economic slowdown. At two-year community colleges, however, enrollment figures boom during these periods when many people have less money and there is more competition for jobs.
Each of the following, if true, helps to explain the enrollment increases in two-year community colleges described above EXCEPT （）.
A. During periods of economic slowdown, two-year community colleges are more likely than four-year colleges to prepare their students for the jobs that are still available.
B. During periods of economic prosperity, graduates of two-year community colleges often continue their studies at four-year colleges.
C. Tuition at most two-year community colleges is a fraction of that at four-year colleges.
D. Two-year community colleges devote more resources than do other colleges to attracting those students especially affected by economic slowdowns.
E. Students at two-year community colleges, but not those at most four-year colleges, can control the cost of their studies by choosing the number of courses they take each term.

[单项选择]Most people are aware that outdoor air pollution can damage their health, but many do not know that indoor air pollution can also (67) health significantly. Environmental Protection Agency studies (68) that indoor levels of pollutants may be 2-5 times, and (69) more than 100 times, higher than outdoor levels.
There are many sources of indoor air pollution in any (70) . These include combustion (燃烧) sources, products for home cleaning and (71) , personal care, or hobbies; central heating and cooling systems and humidification (72) ; and outdoor air pollution.
(73) effects may show up after a single exposure or (74) exposures. These include irritation of the eyes, nose, and throat, headaches, dizziness, and (75) . Such effects are usually short-term and (76) . Sometimes the treatment is simply (77) the person’s exposure to the source of the pollution, (7
A. so
B. because
C. but
D. although