题目内容
（请给出正确答案）
A．It is advantageous to the brains.
B．It helps strengthen the heart.
C．It is good for improving muscle tone.
D．It helps develop mental toughness.
简答题官方参考答案
（由简答题聘请的专业题库老师提供的解答）
更多“A．It is advantageous to the brains.B．It helps strengthen the heart.C．It is good for im”相关的问题
Many species of whales, for example, are in danger of extinction because of hunters who continue whaling despite the world's attempts to limit the annual catch. Seals are also threatened; and with the increasing use of nuclear power to generate electricity, a new danger has arisen: the pollution of oceans by nuclear waste.
(30)
A．The earth cannot last forever, if we do not take care of it.
B．Hunters are destructing the wildlife.
C．Nuclear power is increasingly used to generate electricity.
D．Nuclear waste kills many seals.
B．Through a wide variety of low-frequency sounds.
C．Through their varied swimming gestures.
D．Through the echolocation.
A．Mineral resources do bring people fortune.
B．Fertile soils are nonrenewable sources in fact.
C．People have learned to use land in a protective way.
D．People usually regard groundwater as not replaceable.
So why is this huge increase in population taking place？ It is really due to the spread of the knowledge and practice of what is becoming known as "Death Control". You have no doubt heard of the term "Birth Control". "Death Control" is something rather different. It recognises the work of the doctors and scientists who now keep alive people who, not very long ago, would have died of a variety of then incurable diseases. Through a wide variety of technological innovations that include farming methods and the control of deadly diseases, we have found ways to reduce the rate at which we die. However, this success is the very cause of the greatest threat to mankind.
If we examine the amount of land available for this ever-increasing population, we begin to see the problem. If everyone on the planet had an equal share of land, we would each have about 50,000 square metres. This figure seems to be quite encouraging until we examine the amount of usable land we actually have. More than three-fifths of the worlds land cannot produce food.
Obviously, with so little land to support us, we should be taking great care not to reduce it further. But we are not! Instead, we are consuming its "capital" — its nonrenewable fossil fuels and other mineral deposits that took millions of years to form. but which are now being destroyed in decades. We are also doing the same with other vital resources not usually thought of as being nonrenewable such as fertile soils, groundwater and the millions of other species that share the earth with us.
It is a very common belief that the problems of the population explosion are caused mainly by poor people living in poor countries who do not know enough to limit their reproduction. This is not true. The actual number of people in an area is not as important as the effect they have on nature. Developing countries do have an effect on their environment, but it is the populations of richer countries that have a far greater impact on the earth as a whole.
According to the passage, what contributes to the population increase？
A．Human beings" ignorance.
B．The failure of "Birth Control".
C．The success of "Death Control".
D．Technological innovations.
B．When the food colour changes.
C．When they move to different places.
D．When they are attracted by different smells.
B．They are cheap and popular.
C．They are translated into English.
D．They are convenient for the users.
警告：系统检测到您的账号存在安全风险
为了保护您的账号安全，请在“简答题”公众号进行验证，点击“官网服务”-“账号验证”后输入验证码“”完成验证，验证成功后方可继续查看答案！
