题目内容
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The Arctic is considered ______ (be)a northern part of the Atlantic．
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The energy companies ______ urgent studies of the Arctic environment.
A．made
B．put
C．moved
D．launched
A good title for this passage would be ______.
A．the Arctic Summer
B．Marmots and Squirrels
C．Keeping Warm in the Arctic
D．Freezing Temperatures
Although______happened in the Arctic region sounds like fairy tale, it truly exists.
A．it
B．what
C．which
D．that
A) Phenolics
B) Polyimides
C) Fluorocarbons
D) Polyurethane
A had decreased
B will decrease
C has been decreasing
D is decresing
It can be inferred that Saunders' journey to the North Pole ______.
A．was accompanied by his old playmates
B．set a record in the North Pole expedition
C．was supported by other Arctic explorers
D．made him well-known in the 1960s
A study published recently in the journal Nature shows that air-borne leaded gas emissions from the United States were the leading contributor to the high concentration of lead in the snow in Greenland. The new study is a result of the continued research led by Dr. Charles Boutron, an expert on the impact of heavy metals on the environment at the National Center for Scientific Research in France. A study by Dr. Boutron published in 1991 showed that lead levels in arctic (北极的) snow were declining.
In his new study, Dr. Boutron found the ratios of the different forms of lead in the leaded gasoline used in the United States were different from the ratios of European, Asian and Canadian gasolines and thus enabled scientists to differentiate the lead sources. The dominant lead ratio found in Greenland snow matched that found ingasoline from the United States.
In a study published in the journal Ambio, scientists found that levels in soil in the Northeastern United States had decreased markedly since the introduction of unleaded gasoline.
Many scientists had believed that the lead would stay in soil and snow for a longer period.
The authors of the Ambio study examined samples of the upper layers of soil taken from the same sites of 30 forest floors in New England, New York and Pennsylvania in 1980 and in 1990. The forest environment processed and redistributed the lead faster than the scientists had expected.
Scientists say both studies demonstrate that certain parts of the ecosystem respond rapidly to reductions in atmospheric pollution, but that these findings should not be used as a license to pollute.
The study published in the journal Nature indicates that
A．the Clean Air Act has not produced the desired results.
B．lead deposits in arctic snow on the increase.
C．lead will stay in soil and snow longer than expected.
D．the U.S. is the major source of lead pollution in arctic snow.
In the ancient world, as is today, most boys played with some kinds of toys and most girls with another. In societies where social roles are rigidly determined, boys pattern their play after the activities of their fathers and girls after the tasks of their mothers. This is true because boys and girls are being prepared, even in play, to step into the roles and responsibilities of the adult world.
What is remarkable about the history of toys is not so much how they changed over the centuries but how much they have remained the same. The changes have been mostly in terms of craftsmanship, mechanics, and technology. It is the universality of toys with regard to their development in all part of the world and their persistence to the present that is amazing. In Egypt, the Americas, China, Japan and among the Arctic peoples, generally the same kinds of toys appeared. Variations depended on local customs and ways of life because toys imitate their surroundings. Nearly every civilization had dolls, little weapons, toy soldiers, tiny animals and vehicles.
Because toys can be generally regarded as a kind of art form, they have not been subject to technological leaps that characterize inventions for adult use. The progress from the wheel to the oxcart to the automobile is a direct line of ascent. The progress from a rattle used by a baby in 3000 BC to one used by an infant today, however, is not characterized by inventiveness. Each rattle is the product of the artistic tastes of the times and subject to the limitations of available materials.
