更多"A. The air pollution. B."的相关试题:
[单项选择]One major obstacle to economic development is population growth. The populations of most developing countries grow at a rate much faster than that of in dustrialized countries. One reason for this growth is the high crude birth-rate—the number of live births per 1,000 people.
A. to
B. The populations
C. that
D. live births
[填空题]The survey shows that green food is becoming (popular) _______than traditional food.
[简答题]As a result, the modern world is increasingly populated by intelligent robots whose presence we barely notice but whose universal existence has removed much human labor. And thanks to the continual miniaturization of electronics and micro-mechanics, there are already robot systems that can perform some kinds of brain and bone surgery with far greater precision than highly skilled physicians can achieve with their hands alone. But if robots are to reach the next stage of laborsaving utility, they will have to be able to make at least a few decisions for themselves.
Despite a spell of initial optimism in the 1960s and 1970s when it appeared that transistor circuits and microprocessors might be able to copy the action of the human brain by the year 2010, researchers lately have begun to extend that forecast by decades if not centuries.
[单项选择]Several years ago, as a measure to reduce the population of gypsy moths, which depend on oak leaves for food, entomologists introduced into many oak forests a species of fungus that is poisonous to gypsy moth caterpillars. Since then, the population of both caterpillars and adult moths have significantly declined in those areas. Entomologists have concluded that the decline is attributable to the presence of the poisonous fungus.
Which one of the following, if true, most strongly supports the conclusion drawn by the entomologists
A. A strain of gypsy moth whose caterpillars are unaffected by the fungus has increased its share of the total gypsy moth population.
B. The fungus that was introduced to control the gypsy moth population is poisonous to few insect species other than the gypsy moth.
C. An increase in numbers of both gypsy moth caterpillars and gypsy moth adults followed a drop in the number of some of the species that prey on the moths.
D. In the past several years, air pollution and acid rain have been responsible for a substantial decline in oak tree populations.
E. (E) The current decline in the gypsy moth population in forests where the fungus was introduced is no greater than a decline that occurred concurrently in other forests.
[单项选择]
The term "disruptive technology" is popular, but is widely misused. It refers not simply to a clever new technology, but to one that undermines an existing technology-and which therefore makes life very difficult for the many businesses which depend on the existing way of doing things. Twenty years ago, the personal computer was a classic example. It swept aside an older mainframe-based style of computing, and eventually brought IBM, one of the world’s mightiest firms at the time, to its knees. This week has been a coming-out party of sorts for another disruptive technology, "voice over internet protocol" (VOIP), which promises to be even more disruptive, and of even greater benefit to consumers, than personal computers.
VOIP’s leading proponent is Skype, a small firm whose software allows people to make free calls to other Skype users over the internet, and very cheap calls to traditional telephones-all of which spells trouble for incumben
A. states the popularity of the term
B. indicates a clever new technology
C. undermines an existing technology
D. corrects a misconception
[简答题]
Despite wars, famines, and epidemics, Earth’s population is
booming ahead to new records—with no end in sight.
Every day,
the world adds enough people to populate a medium-sized city in the US. In one
month, the number of new-world citizens equals the population of New York
City.
Every year, there are 90 million more mouths to feed, more
than the total population of Germany.
Several factors are
propelling this rapid growth, including an element that is often overlooked: the
huge number of teenagers who are becoming mothers, particularly in the countries
of sub-Saharan Africa.
In four African nations—Niger, Mali,
Sierra Leone, and Ivory Coast—1 out of every 5 adolescent females of
childbearing age has a baby annually.
The US Bureau of the
Census says this high rate of motherhood among teens has helped to maintain the
high pace of births across most of the African continent. By starting a family
early, a typical woman in Som
[单项选择]It’s hot now in Afghanistan, where 35% of the population is under-fed. But soon it will be cold, and many of the country’s roads will become inaccessible because of snow and landslides, making it difficult to get food to market.
Knowing these things gets Stacy McCoy out of bed every morning and out into the countryside, visiting Afghani women and farmers to offer new agricuhural techniques and hardier seeds. She also works to improve their marketing skills so that they can be exposed to new ways To sell goods in the marketplace. The marketing efforts have helped organize the women and farmers into teams so that they have more food to offer collectively and can work more closely together to share their knowledge.
McCoy is one of many American scientists who have devoted their careers to international development in the name of making the world a better place. "It can be hard living away from family and that is a choice sometimes going into international work, but I’m pre
A. It’s hard but safe.
B. It’s satisfying and safe.
C. It’s hard and insecure.
D. It’s insecure but satisfying.
