更多"[单选题]Many people believe the glare "的相关试题:
[单选题]Many people believe the glare from snow causes snow-blindness． Yet, dark glasses or not,they find themselves suffering from headaches and watering eyes, and even snow-blindness, when exposed to several hours of "snow light"．
The United States Army has now determined that glare from snow does not cause snow-
blindness in troops in a snow-covered country． Rather, a man's eyes frequently find nothing to focus on in a broad expanse of barren snow-covered terrain． So his gaze continually shifts and jumps back and forth over the entire landscape in search of something to look at． Finding nothing,hour after hour, the eyes never stop searching and the eyeballs become sore and the eye musclesache． Nature offsets this irritation by producing more and fluid which covers the eyeball． The fluid covers the eyeball in increasing quantity until vision blurs, then is observed, and the result is
total, even though temporary, snow-blindness．
Experiments led the Army to a simple method of overcoming this problem． Scouts ahead of a main body of troops are trained to shake snow from evergreen bushes, creating a dotted line as they cross completely snow-covered landscape． Even the scouts themselves throw lightweight, dark colored objects ahead on which they too can focus． The men following can then see something．Their gaze is arrested． Their eyes focus on a bush and having found something to see, stop scouring the snow-blanketed landscape． By focusing their attention on one object at a time, the men can cross the snow without becoming hopelessly snow-blind or lost． In this way the problem of crossing a solid white terrain is overcome．
A suitable title for this passage would be __________ ．
A.Snow-Blindness and How to Overcome It
B.Nature's Cure for Snow Blindness
C.Soldiers in the Snow
D.Snow Vision
[单选题]Many kinds of animals have vanished from the earth.
A.developed
B.disappeared
C.linked
D.renewed
[单选题]We wanted to offer help,but the fierce glare on his face stopped us.
A.angry
B.cold
C.severe
D.gloomy
[不定项选择题]共用题干
Why So Many Children
In many of the developing countries in Africa and Asia,the population is growing fast.The reason for this is simple:Women in these countries have a high birth rate—from 3 .0 to 7.0 chil-dren per woman.The majority of these women are poor,without the food or resources to care for their families .Why do they have so many children?Why don't they limit the size of their fami-lies?The answer may be that they often have no choice.There are several reasons for this.
One reason is economic .In a traditional agricultural economy,large families are helpful. Having more children means having more workers in the fields and someone to take care of the parents in old age.In an industrial economy,the situation is different.Many children do not help a family;instead,they are an expense.Thus,industrialization has generally brought down the birth rate .This was the case in Italy,which was industrialized quite recently and rapidly.In the early part of the twentieth century,Italy was a poor,largely agricultural country with a high birth rate .After World War Ⅱ,Italy's economy was rapidly modernized and industrialized.By the end of the century,the birth rate had dropped to 1.3 children per woman,the world's lowest.
However,the economy is not the only important factor that influences birth rate.Saudi Ara-bia,for example,does not have an agriculture-based economy,and it has one of the highest per capita incomes in the world.Nevertheless,it also has a very high birth rate(7.0).Mexico and Indonesia,on the other hand,are poor countries,with largely agricultural economies,but they have recently reduced their population growth.
Clearly,other factors are involved.The most important of these is the condition of women.A high birth rate almost always goes together with lack of education and low status for women.This
would explain the high birth rate of Saudi Arabia .There,the traditional culture gives women little education or independence and few possibilities outside the home.On the other hand,the im-proved condition of women in Mexico,Thailand,and Indonesia explains the decline in birth rates in these countries.Their governments have taken measures to provide more education and oppotunities for women.
Another key factor in the birth rate is birth control.Women may want to limit their families but have no way to do so．In countries where governments have made birth control easily available and inexpensive,birth rates have gone down.This is the case in Singapore,Sri Lanka,and India，as well as in Indonesia,Thailand,Mexico,and Brazil.In these countries,women have also been provided with health care and help in planning their families．
These trends show that an effective program to reduce population growth does not have to de-pend on better economic conditions.It can be effective if it aims to help women and meet their needs .Only then,in fact,does it have any real chance of success．
In Mexico,Thailand,and Indonesia,the government____.
A.is not concerned about the status of women
B.has tried to industrialize the country rapidly
C.does not allow women to work outside the home
D.has tried to improve the condition of women
