According to scientists, people sneeze because________

A．they are ill

B．to sneeze is human nature

C．they do not need any conscious help

D．there are unwanted things in their noses

查看答案及解析进入在线模考

参考答案

答案解析

从“When you need to sneeze you sneeze，this being nature’s clever way of getting rid of an annoying object from the nose．The object may be just some dust in the nose which nature is striving to remove．”可知。此题考查对段落文意的理解。在最后一段中“nature”作为关键词，是判断本题的重要依据。

你可能感兴趣的试题

1 根据下面资料，回答题：
There was one thought that air pollution affected only the area immediately around large cities with factories and heavy automobile traffic. At present, we realize that although these are the areas with the worst air pollution, the problem is literally worldwide. On several occasions over the paste decade, a heavy cloud of air pollution has covered the east of the United States and brought health warnings in rural areas away from any major concentration of manufacturing and automobile traffic. In fact, the very climate of the entire earth may be infected by air pollution. Some scientists consider that the increasing concentration of carbon dioxide in the air resulting from the burning of fossil fuels(coal and oil)is creating a "greenhouse effect"--conserving heat reflected from the earth and raising the world' s average temperature. If this view is correct and the world' S temperature is raised only a few degrees, much of the polar ice cap will melt and cities such as New York, Boston, Miami, and New Orleans will be in water.
Another view, less widely held, is that increasing particular matter in the atmosphere is bloc-king sunlight and lowering the earth's temperature--a result that would be equally disastrous. A drop of just a few degrees could create something close to a new ice age, and would make agriculture difficult or impossible in many of our top farming areas. Today we do not know for sure that either of these conditions will happen (though one recent government report drafted by experts in the field concluded that the greenhouse effect is very possible). Perhaps, if we are lucky enough, the two tendencies will offset each other and the world's temperature will stay about the same as it is now.
Driven by economic profit, people neglect the damage on our environment caused by the "advanced civilization". Maybe the air pollution is the price the human beings have to pay for their development. But is it really worthwhile?
As pointed out at the beginning of the passage, people used to think that air pollution_________

A．caused widespread damage in the countryside

B．affected the entire eastern half of the United States

C．had damaged effect on health

D．existed merely in urban and industries areas

查看解析在线模考

2 As to the greenhouse effect, the author___________

A．shares the same view with the scientists

B．is uncertain of its occurrence

C．rejects it as being ungrounded

D．thinks that it will destroy the world soon

查看解析在线模考

3 The word "offset" in the second paragraph could be replaced by_______

A．slip into

B．make up for

C．setup

D．catch up with

查看解析在线模考