题目内容
Increasing pollution will of course not ________ the constant development of the world.
make up
make for
make use of
make out
As people slowly learn to cure diseases, control floods, prevent hunger, and stop wars, fewer people die every year. As a result, the population of the world is becoming larger. In 1925 there were about 2 billion people in the world; today there are over 6 billion.
When the number rises, extra mouths must be fed. New lands must be brought under development, or land already farmed must be made to produce more crops. In some areas the land is so over-developed that it will be difficult to make it provide more crops. In some areas the population is so large that the land is divided into too tiny units to make improvement possible with farming methods. If a large part of this farming population went into industrial work, the land might be farmed much more productively (多产地) with modern methods.
There is now a race for science, technology, and industry to keep the output of food rising faster than the number of people to be fed. New types of crops, which will grow well in bad weather, are being developed, so there are now farms beyond the Arctic Circle in Siberia and North America. Irrigation (灌溉) and dry-farming methods bring poor lands under the plough. Dams hold back the waters of great rivers, which can provide water for the fields in all seasons and provide electric power for new industries. Industrial chemistry provides fertilizer to suit different soils. Every year, some new methods are made to increase or to protect the food of the world.
【小题1】The author says that the world population is increasing because _____.
A.there are many rich valleys and large fields |
B.farmers are producing more crops than before |
C.people are living longer due to better living conditions |
D.new lands are being made into farmlands |
A.the land was divided into smaller pieces |
B.people moved into the countryside |
C.industrial methods were used in farming |
D.the units of land were much larger |
A.growing new types of crops | B.irrigation and dry-farming means |
C.providing fertilizers | D.destroying pests and diseases |
A.To develop a new kind of dry-farming methods. |
B.To prevent crops from floods. |
C.To provide water and electricity in all seasons. |
D.To water poor lands in bad weather. |
Not all think laughter is the best medicine, but it seems to help.So scientists carried on a new study of diabetes (糖尿病) patients who were given a good dose of humor for a year to prove it.
Researchers divide 20 high-risk diabetic patients into two groups.Both groups were given standard diabetes medicine.Group L viewed 30 minutes of humor of their choice, while Group C, the control group, did not.This went on for a year of treatments.
By two months into the study, the patients in the laughter group had lower level of the hormones epinephrine (肾上腺素), considered to cause stress, which is known to be deadly.After the 12 months, HDL cholesterol rises 26 percent in Group L but only 3 percent in Group C.In another measure, C-reactive proteins, a maker of heart disease, drop 66 percent in the laughter group but only 26 percent in the control group.
“The best doctors believe that there is a physical good brought about by the positive emotion, happy laughter,” said study leader Lee Berk of Loma Linda University.And other research has found that humor makes us more hopeful.Still, more study is needed, Berk said.The research by Berk found that humor can bring about similar changes in body chemistry, which was proved in the new study.The research result will be presented this month at the meeting in the US.Research at the University of Maryland School of Medicine shows that laughter causes the inner lining of blood vessels to expand, increasing blood flow in a way thought to be healthy.
“Lifestyle choices have an important effect on health and these are choices which we and patients should pay attention to, rather than prevention and treatment,” Berk said in a statement this week.
【小题1】Why did the scientists carry on the new research?
A.To find out if laughter was good to health. |
B.To discover the best medicine to cure diabetes. |
C.Because the number of diabetic patients is the largest in the world. |
D.Because diabetic patients need more laughter than other patients. |
A.C-reactive proteins increase 66 percent in Group C |
B.the level of the hormones epinephrine stays the same in both groups |
C.the level of the hormones epinephrine has dropped |
D.C-reactive proteins reduced 66 percent in Group L |
A.something bad to our health | B.something good to our health |
C.a kind of wonderful medicine | D.a kind of dangerous disease |
A.Blood is made thick by laughter. |
B.Laughter makes blood vessels thin. |
C.Laughter increases blood pressure. |
D.Laughter makes blood flow fast. |
A.choose lifestyles carefully |
B.change our lifestyles |
C.prevent our lifestyles in advance |
D.pay less attention to the positive emotion |