题目内容
（请给出正确答案）
A.continuation
B.endurance
C.existence
D.survival
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更多“A winter _________ technique in mammals is a slowing of the physiological processes, including reduc…”相关的问题
We learn from the passage that ______.
A．the bacteria are only effective against three species of beetles
B．Fields' technique is less effective in winter
C．Fields' technique may kill nearly all the beetles at -10℃
D．Insects may develop resistance against the bacteria
Insect pests die if they freeze, but many have the ability to become "supercool", remaining alive even when the temperature drops to - 10℃. However, Paul Fields of the Agriculture Canada Research Station in Winnipeg has discovered that the ability of these insects to supercool can be seriously affected by "ice-nucleating-active bacteria". When the bacteria are present, the insects freeze and die at a higher temperature than normal.
Ice-nucleating-active bacteria are found naturally on most plant leaves. They are also grown commercially for use in cloud seeding and in making artificial snow.
Fields added these bacteria to wheat which was stored at a temperature of - 10℃ and contained the rusty grain beetle. He found that when the bacteria accounted for only 10 parts per million of the grain, the beetles' supercooling point rose from - 11.3℃ to - 7.1℃, so more died. At concentrations of 100 ppm or 1000 ppm, the bacteria increased the supercooling point to as high as -6.3℃, which resulted in more than 75 percent of the beetles dying.
Fields also applied the bacteria to two other species of grain beetle, Sitophilus granarius and Oryzaephilus surinamensis, keeping them at - 10℃. He found that more of these beetles also died. First, though, he gradually acclimatized some of the insects to cold, to simulate the increase in tolerance to cold which they normally develop as winter approaches. Fields found that the insects that had been acclimatized were less affected by cold than the beetles that had not been acclimatized, but that more of them still died at - 10℃.
Fields says that the technique of using ice-nucleating-active bacteria leaves no noxious chemical residues and poses little risk to the people who apply the treatment. It is also effective against insects which have become resistant to pesticides.
Which of the following statements about ice-nucleating-active bacteria is true？
A．They may cool the grain to - 10℃.
B．They can weaken the beetles' resistance to coldness.
C．They can be grown on most plant leaves.
D．They are used only in biological researches.
Passage Two
In spring, chickens start laying again, bringing a welcome source of protein at winter’s end. So it’s no surprise that cultures around the world celebrate spring by honoring the egg.
Some traditions are simple, like the red eggs that get baked into Greek Easter breads.Others elevate the egg into a fancy art, like the heavily jewel-covered “eggs” that were favored by the Russians starting in the 19th century.
One ancient form. of egg art comes to us from Ukraine. For centuries, Ukrainians have been drawing complicated patterns on eggs. Contemporary artists have followed this tradition to create eggs that speak to the anxieties of our age: Life is precious, and delicate. Eggs are, too.
“There’s something about their delicate nature that appeals to me,” says New Yorker cartoonist Roz Chast. Several years ago, she became interested in eggs and learned the traditional Ukrainian technique to draw her very modem characters. “I’ve broken eggs at every stage of the process—from the very beginning to the very, very end.”
But there’s an appeal in that vulnerability. “There’s part of this sickening horror of knowing you’re walking on the edge with this, that I kind of like, knowing that it could all fall apart at any second.” Chast’s designs, such as a worried man alone in a tiny rowboat, reflect that delicateness.
Traditional Ukrainian decorated eggs also spoke to those fears. The elaborate patterns were believed to offer protection against evil.
“There’s an ancient legend that as long as these eggs are made, evil will not prevail in the world,” says Joan Brander, a Canadian egg-painter who has been painting eggs for over 60 years, having learned the art from her Ukrainian relatives.
The tradition, dating back to 300 B.C., was later incorporated into the Christian church. The old symbols, however, still endure. A decorated egg with a bird on it, given to a young married couple, is a wish for children. A decorated egg thrown into the field would be a wish for a good harvest.
Why do people in many cultures prize the egg？
A.It is a welcome sign of the coming of spring
B.It is their major source of protein in winter
C.It can easily be made into a work of art
D.It can bring wealth and honor to them
Why have contemporary artists continued the egg art tradition？A.Eggs serve as an enduring symbol of new life
B.Eggs have an oval shape appealing to artists
C.Eggs reflect the anxieties of people today
D.Eggs provide a unique surface to paint on
What do we learn about the decorated “eggs” in Russia？A.They are shaped like jewel cases
B.They are cherished by the rich
C.They are heavily painted in red
D.They are favored as a form of art
Why does Chast enjoy the process of decorating eggs？A.She never knows if the egg will break before the design is completed
B.She can add multiple details to the design to communicate her idea
C.She always derives great pleasure from designing something new
D.She is never sure what the final design will look like until the end
What do we learn from the passage about egg-painting？A.It originated in the eastern part of Europe
B.It has a history of over two thousand years
C.It is the most time-honored form of fancy art
D.It is especially favored as a church decoration
请帮忙给出每个问题的正确答案和分析，谢谢！
反义寡核苷酸技术(antisense oligonucleotide technique)
Detailed knowledge of each of the jet streams of the earth's hemispheres-
its location, altitude and strength-is critical to modern-day weather
forecasting, as well as to more specific applications such as the routing of
Line aircraft. By way of definition, a jet in fluid dynamics is simply a core of fluid
(5) moving at a higher velocity than the surrounding fluid, and although
complicated to describe mathematically, the jet streams in the atmosphere are a
straightforward, natural result of the meridional (equator-to-pole) temperature
gradient in the earth' s atmosphere. Analogous flows exist on other planets with
substantial atmospheres having similar temperature gradients.
(10) The temperature gradient derives from the differential solar heating of the
spherical surface of a planet: the surface is generally warmest at the equator
and grows progressively cooler as one moves poleward. The centrifugal effects
of the earth's rotation, often called the Coriolis force, deflect the north-south
transport of heat from the equator to the poles into the predominantly east-west
(15) motion of the jet stream. The relative strength, or velocity, of the jet stream is
proportional to the intensity of this thermal gradient. During the winter
months, when the equator-to-pole temperature disparity is at its greatest, the
jet stream reaches its maximum velocity, while during the summer months,
when the temperature gradient between the equator and the pole is considerably
(20) less, the jet stream reaches its minimum velocity.
The jet stream does not maintain a straight, zonal flow from west to east
but rather takes on a more serpentine look, often with dramatic dips to the
south or rises to the north. There are two major reasons for these nonzonal
motions: the temperature gradient between the equator and the poles and the
(25) presence of land masses on the earth's surface. The meridional temperature
gradient between the equator and poles that gives rise to the jet stream also
produces secondary atmospheric circulations, or eddies which, referred to by
meteorologists as baroclinic waves, have a complex interaction with the jet
stream, one that is intriguingly two-sided. The eddies modify the distribution of
(30) temperature and kinetic energy within the atmosphere, a process that has a
pronounced effect on the location and movement of the jet stream, which itself
interacts with these waves, acting not only as a transport or steering
mechanism but transferring momentum and energy back to the waves.
The presence of land masses on the earth's otherwise watery surface also
(35) modifies the distribution of temperature, because continents heat and cool at a
dramatically slower rate than do the oceans. The topography of the land also
influences the jet stream's location-mountain ranges and plains on large
continents, for example, significantly imbalance the distribution of atmospheric
temperature, narrowing the jet stream. And since the jet stream is a thermally
(40) driven phenomenon, the more complicated the three-dimensional temperature
structure of the earth's atmosphere, the more "wand
A．interpret data
B．explain research methodology
C．evaluate a conclusion
D．suggest a new technique
E．describe a phenomenon
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