[单项选择]If the population keeps on growing, there will eventually not be enough resources left to (support) life on the earth.
A. detain
B. continue
C. contain
D. maintain

[单项选择]

The world’s population keeps growing. There are now about 4 billion of us on earth. That could reach 6 billion by the end of the century and 11 billion in a further 75 years. Experts have long been concerned about such a growth. Where will we find the food, water, jobs, houses, schools and medicine to care for all these people
A major new study shows that the situation may be changing. A large and rapid drop in the world’s birth rate has taken place during the past 10 years. Families generally are smaller now than they were a few years ago. It is happening in both developing and industrialized nations.
Researchers said they found a number of reasons for this. More men and women are waiting longer to get married and are using birth control devices and methods to prevent or delay pregnancy. More women are going to school or working at jobs away from home instead of having children. And more governments, especially in developing nations, now support famil
A. In all countries in the world.
B. In only a few countries.
C. In most countries.
D. Mainly in developed countries.

[多项选择]With an aging population growing rapidly, China is faced with a prospect of labour shortage. Some people suggest that the government should modify its family-planning policy in order to maintain a sufficient labour force while others argue that the huge population still remains a serious challenge to China, therefore, the government should continue its family-planning policy. Write an article to express your opinion on this issue. You should use your knowledge or experience to generate support for your argument. You should write no less than 250 words.

[填空题]As the population of the world keeps on growing, it gets more and more difficult to feed everyone. The United States is one of the lucky countries because it grows enough food for itself and still has enough to export to other parts of the world. One reason for this is that the United States is a large country with a variety of climates. Most of the central part of the country is especially suitable for raising grain. Wheat and corn are the most important crops in the region. The United States exports millions of tons of grain every year. Wheat is used to make bread, a basic food throughout the world. Most of the corn is used to feed animals, which in turn become food themselves.
The southeastern part of the United States has a warm, damp climate. It grows cotton, rice and sugar. Florida specializes in fruits and vegetables. It is famous for its orange, lemons and grape. Florida has warm weather all year round, so it can provide vegetables for the rest of the country in the middle o

[单项选择]

The United States population is growing older. In 1987, 12 percent of Americans were 65 years old or older, compared with 8 percent in 1950. Population experts at the U.S. Bureau of the Census expect this percentage to continue to rise gradually, reaching 14 percent in 2010, then to skyrocket during the next 20 years, reaching 21 percent by 2030. This "graying of America" has generated concerns about whether the best really is yet to be, about how well off tomorrow’s elderly will be. There also are questions about the impact of an aging population on the rest of society.
The graying of America has two causes. First, advances in medical care have enable people to live longer. In the United States in 1900, the average life expectancy at birth was 47.7 years. By 1985, the latest year for which figures are available, it has climbed to 74.7 years.
Second, the U.S. birthrate rose in the mid-1900s, interrupting a long, slow decline. A dramatic increase oc
A. To bring attention to the needs of the elderly.
B. To contrast birth rates and life expectancy rates.
C. To explain how and why the American population is aging.
D. To show the percentages of age groups in general population.

[简答题]World population is growing at such a rate that by the year 2050 nearly seven billion people will live on the earth. (Passage One)

[简答题]

A new report says the growing population around the world is harming the environment. More people are using more of the Earth’s natural resources than ever before. Experts say poor people around the world will suffer most in the future unless environmental damage is stopped. They say more should be done to balance human and environmental needs.
The United Nations Population Fund is responsible for studying population growth. It released the report about the subject. It examines the links among environmental conditions, population growth and efforts to help poor people in developing countries.
The world population is now more than 6,000 million people. That number has increased by 100% since 1960. The population is expected to increase to more than 9,000 million by the year 2050. The report says about 2,000 million people lack food security. Water supplies and agricultural lands are heavily used. In 50 years, experts say more than 4,000 million people will be