题目内容

The public is well aware that high blood cholesterol levels raise the risk of stroke caused by blood clots. But a recent report concludes that people with low blood cholesterol levels are at increased risk of the other lethal type of stroke-cerebral hemorrhage, caused when a brain artery bursts. The report suggests that because blood cholesterol plays a vital role in maintaining cell membranes, low blood cholesterol weakens artery walls, making them prone to rupture. The conclusion thus supports a long-standing contention by Japanese researchers that Western diets better protect against cerebral hemorrhage than do non-Western diets. The argument is based on which one of the following assumptions

A. Western diets are healthier than non-Western diets.
B. Western diets result in higher blood cholesterol levels than do non-Western diets.
C. High blood cholesterol levels preclude the weakening of artery walls.
D. Cerebral hemorrhages are more dangerous than strokes caused by blood clots.
E. People who have low blood pressure are at increased risk of cerebral hemorrhage.

查看答案

搜索结果不匹配？点我反馈

更多问题

Although part of the ivory available on world markets was taken from wild elephants that were killed illegally, some ivory is derived from sources that nearly all nations define as legal, such as elephants that have died natural deaths. The world’s few remaining wild elephant herds, therefore, are not endangered when those buying ivory at wholesale make a serious effort to limit their purchases to such legal ivory. The argument above depends on the assumption that

A. wholesale buyers attempting to limit their purchases to legal ivory can reliably distinguish legal from illegal ivory.
B. the demand for products made from legal ivory will continue to grow in the near future.
C. there are currently fewer wholesale sources of legal ivory in the world than there are of illegal ivory.
D. wholesale buyers of ivory products are generally unaware of the reasons for the dwindling world supply of ivory.
E. a continued supply of legal ivory is ensured because elephants reproduce in captivity.

查看答案

一般抹灰质量验收标准，保证项目质量的要求：各抹灰层之间及抹灰层与基层之间必须粘结牢固，无脱层、空鼓现象，面层无爆灰和裂缝等缺陷。检查方法：用小锤轻击和观察检查。( )

A. 对
B. 错

查看答案

Some doomsayers are warning that long-range warming or cooling trends in weather patterns will drastically reduce grain production. More optimistic reports, however, point out that, even if such drifts in average temperature do occur, we should expect little change in grain production because there is little evidence that changes in rainfall patterns will occur. Moreover, for most crops, climate-induced yield trends will be masked by both the year-to-year fluctuation of yields and by the enhancement of yields because of technological factors. Which of the following is an assumption on which the more optimistic reports mentioned in the passage are based

A. Long-range changes in weather patterns cannot be accurately predicted.
B. The growing of grain is so highly dependent on technological factors that improvements in yield are unlikely, regardless of climatic conditions.
C. Trends in rainfall patterns are more difficult to isolate than are trends in temperature.
D. Long-range warming or cooling trends are more damaging to grain production if they are accompanied by changes in rainfall patterns than if they are not.
E. Long-range cooling trends are potentially more destructive to grain production than are long-range warming trends.

查看答案

灰饼的大小以10cm长、5cm宽为宜，若过宽，灰饼的边缘往往会高于拉线点。( )

A. 对
B. 错

查看答案