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226.
Cooperative apartment houses have the peculiar distinction of being dwellings that must also operate as businesses.？？？？ 227.
Coronary angiography, a sophisticated method for diagnosing coronary disease, involves the introduction of dye into the arteries of the heart and is now administered selectively, because it uses x-rays to observe cardiac function.
228. Corporations will soon be required to report to the government whether
they have the necessary reserves to pay the pension benefits earned by their employees, information that must also be published in annual reports to shareholders.
229. Crises in international diplomacy do not always result from malice; for nations, like individuals, can find themselves locked into difficult positions, unable to back down.
For 作为表示因果关系的连词的用法： 1)用于正式语体。
2) because 的位置灵活，for 只能位于主句之后，由逗号隔开：He is absent today, for he is ill.
3) Because 可以回答 why 问句，for 不可以
4) Because 之前可以带并列连词或强调词，for 不可以。 5) 连词 for 可以引导一个独立的句子，为上文的情况说明原因或理由。也就是说 for 可以跟在逗号，分号，句号之后。Because 一般不引导单独分句，回答 why 问句时 可以是一个例外。
230. Critics of the trend toward privately operated prisons consider
corrections facilities an integral part of the criminal justice system and question whether profits should be made from incarceration. 231.
Cut-paper design, a popular pastime of Colonial women, became an art form in the hands of Abigail Lefferts Lloyd, a Revolutionary War heroine. the 如果不是特指强调(一般指独一无二的东西,如著名的专有名词)，the 作同位不如 a 好
232. Dance fans knew Tamara Geva as a soloist in several Ballanchine works,
as the dancer who introduced his choreography to the United States, and as a
star in Broadway theater. 233.
Darwin was not the first to advance a theory of evolution; his tremendous
originality lay in his proposal of natural selection as the means by which
evolution worked. 比 lay in the fact that he proposed the idea 简洁 234.
Declining values for farm equipment and land, the collateral against which farmers borrow to get through the harvest season, are going to force many lenders to tighten or deny credit this spring.
235. Defense attorneys have occasionally argued that their clients’ misconduct
stemmed from a reaction to something ingested, but if criminal or delinquent behavior is attributed to an allergy to some food, the perpetrators are in effect told that they are not responsible for their actions.
236. Degler does more than merely summarize existing research; he constructs a coherent picture of two centuries of studies dealing with the changing roles of women. 237.
238. Dental caries and gingivitis can be exacerbated not only by what patients eat but also by when they eat it. it 指代名词性从句 what patients eat；what patients eat 和 when they eat it 在此都是名词性从句；该句比 not only by the foods patients eat but also by time when the foods are eaten 好，比其简洁，而 且主动比被动好；
Delighted by the reported earnings for the first quarter of the fiscal year,
the company manager decided to give her staff a raise.
239. Despite its attractiveness, investing abroad can still pose big risks,
ranging from the potential for political instability in some countries to the shortage of regulations to protect investors and a serious lack of information about investments in others. 240.
Although it has not been proved that the consumption of any particular
food will reverse hardening of the arteries, studies indicate that refraining from eating certain foods can help reverse blockage of coronary arteries, the blood vessels that feed the heart.
241. Despite protests from some waste-disposal companies, state health
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officials have ordered that the levels of bacteria in seawater at popular beaches be measured and the results published. 242.
Despite the recent election of a woman to the office of prime minister, the
status of women in Pakistan has changed little in the last century. 243.
Developing nations in various parts of the world have amassed $700
billion in debts; at stake, should a significant number of these debts be
repudiated, is the solvency of some of the world’s largest multinational banks. 244.
Dirt roads may evoke the bucolic simplicity of another century, but
financially strained townships point out that dirt roads cost twice as much to
maintain as paved roads do. 245.
Discrimination in wages paid in predominantly male occupations over the predominantly female has given rise to substantial differentials between the wage of housepainters and secretaries and between the wages of parking-lot attendants and library assistants.
246. Displays of the aurora borealis, or “northern lights,” can heat the
atmosphere over the arctic enough to affect the trajectories of ballistic missiles and induce electric currents that can cause blackouts in some areas and corrosion in north-south pipelines.
247. Distinguished architecture requires the expenditure of large sums of
money, even though it is by no means certain that the expenditure of large
sums of money produces distinguished architecture. 248.
Doctors generally agree that such factors as cigarette smoking, eating rich
foods high in fats, and alcohol consumption not only do damage by themselves but also aggravate genetic predispositions toward certain diseases. 249.
Doctors still know little about how the Listeria bacterium is spread and
why the disease it causes, listeriosis, afflicts some people in a contaminated
area while sparing many others. 250.
Domestic automobile manufacturers have invested millions of dollars in research to develop cars even more gasoline-efficient than those at present on
the road. 251.
Downzoning, zoning that typically results in the reduction of housing
density, allows for more open space in areas where there are few services and
little available water. 252.
Dr. Hakuta’s research among Hispanic children in the United States
indicates that the more the children use both Spanish and English, the greater their intellectual advantage in skills underlying reading ability and nonverbal logic. 253.
Dr. Hegsted argues that just as polio vaccine is given to every person to
protect the few who might actually contract polio, mass dietary change is needed to protect the significant number who are susceptible to the life-threatening effects of press eating habits. 254.
Dr. Sayre’s lecture recounted several little-known episodes in the relation
of one nation with another that illustrates what is wrong with alliances and treaties that do not have popular support.
255. Dr. Tonegawa won the Nobel Prize for discovering how the body can
constantly change its genes to fashion a seemingly unlimited number of antibodies, each targeted specifically at an invading microbe or foreign substance.
256. During an era when interracial tensions in the United States ran high, Rosa Parks became a quiet, unassuming symbol of the continued struggle for human dignity.
257. During an ice age, the buildup of ice at the poles and the drop in water
levels near the equator speed up the Earth’s rotation, just as a spinning figure skater increases speed by drawing in her arms
258. During her lecture the speaker used map to clarify directional terms, for not everyone attending knew that winds are designated by the direction from which they come.
259. During Roosevelt’s years in office Black Americans began voting for
Democrats rather than Republicans in national elections, but Black support