The first two stages in the development of civiliz... - 搜题云问答

第1题

The first two stages in the development of civilized man were probably the invention of pr

imitive weapons and the discovery of fire, although nobody knows exactly when people acquired the use of (1)_____.

The (2)_____ of language is also obscure. No doubt it began very gradually. Animals have a few cries that serve (3)_____ signals, (4)_____ even the highest apes have not been found able to pronounce words (5)_____ with the most intensive professional instruction. The superior brain of man is apparently (6)_____ for the mastering of speech. When man became sufficiently intelligent, we must suppose that he (7)_____ the number of cries for different purposes. It was a great clay (8)_____ he discovered that speed could be used for narrative. There are those who think that (9)_____ picture language preceded oral language. A man (10)_____ a picture on the wall of his cave to show (11)_____ direction he had gone, or (12)_____ prey he hoped to catch. Probably picture language and oral language developed side by side. I am inclined to think that language (13)_____ the most important single factor in the development of man.

Two important stages came not (14)_____ before the dawn of written history. The first was the domestication of animals; the second was agriculture. Agriculture was (15)_____ in human progress to which subsequently there was nothing comparable (16)_____ our own machine age. Agriculture made possible (17)_____ immense increase in the number of the human species in the regions where it could be successfully practised. (18)_____ were, at first, only those in which nature fertilized the soil (19)_____ each harvest. Agriculture met with violent resistance from the pastoral nomads, but the agricultural way of life prevailed in the end (20)_____ the physical comforts it provided.

A．the latter

B．the later

C．the second

D．the latest

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第2题

During the accurate reproduction stage the correction procedure can consists of two b

asic stages: showing incorrectness and using correction techniques.()

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第3题

Nearly two thousand years have passed______ the Chinese first invented the compass.A．whenB

Nearly two thousand years have passed______ the Chinese first invented the compass.

A．when

B．before

C．since

D．after

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第4题

________classes are English and math.

A.The first two

B.Two the first

C.First two the

D.The two first

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第5题

Chaplin was an immensely talented man: Within only two years of his first appearance in motion pictu

res in 1914, he became one of the best-known personalities in the nation.

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第6题

Irene was evidently a heavy smoker, for the first two fingers of her right hand were

________ with nicotine.

A.addicted

B.stabbed

C.stained

D.radiated

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第7题

The relationship between the first two paragraphs can be described asA．the Catholic Church

The relationship between the first two paragraphs can be described as

A．the Catholic Church of the past compared with that of today.

B．the problem with the Catholic Church revealed and explained.

C．the reform. of the catholic Church argued for and against.

D．the practice of the Catholic Church introduced and condemned.

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第8题

According to the first paragraph an American student is allowed______.A．to live in a diffe

According to the first paragraph an American student is allowed______.

A．to live in a different university

B．to take a particular course in a different university

C．to live at home and drive to class

D．to get two degrees from two different universities

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第9题

When stars like our Sun die, they bloat to become red giants and then eject gigantic cloud

s of gas and dust into space. Increasingly, however, scientists found themselves at a profound loss to explain how exactly dying stars could blow away these clouds. Now astrophysicists propose that unexpected chemical reactions during the formation of stardust could help solve this mystery.

Stars smaller than the Sun and up to eight times as massive die by swelling up into red giants before shedding most of their mass to shrink into very compact, dying embers(灰烬) called white dwarfs. Two kinds of red giants exist-those with lots of carbon, and others richer in oxygen than in carbon. Carbon-rich stars release carbon particles during their death throes. Scientists proposed these pitch-black grains absorb rays from the dying star and get shot into space by starlight, a theory that fit both the observations and computer models.

Increasingly, however, researchers could not explain how oxygen-rich stars like our own Sun could propel their clouds away during the final stages of mass loss. Oxygen-rich stars create large quantities of water vapor and silicates, such as quartz(石英砂) or sand. These are transparent, meaning starlight should go right through them.

Possible solutions have been contemplated by scientists. They first pondered whether the silicates might have iron in them, which would render them opaque instead of transparent. But calculations showed the dust grains would have evaporated if they had iron in them. They next wondered if enough molecules surrounded the core of a dying oxygen-rich star to block out its light and thus create a wind that blew the star's outermost layer into space. But their models suggested these molecules could not block off enough light and create strong enough Rinds.

The scientists then suggested that pulsations occurred when stars die could perhaps force a star's matter out, but this idea did not match with astronomers' observations. But inspiration then dawned upon them. Perhaps some of the carbon in the oxygen-rich stars could help force the outer layers of the stars into space. They believe shock waves from the pulsations of dying stars could make carbon in oxygen-rich stars form. pitch-black dust.

"The theory fits with all our subsequent model calculations, and it matches observations from dying oxygen-rich red giants". Moreover", this mechanism strongly favors the presence of magnesium silicates over iron silicates in the interstellar medium", in agreement with recent findings from NASA's comet-sampling Stardust space probe. If proven correct, the beauty of the new scenario is that it suggests a common driving mechanism for many dying stars shedding their mass via dusty winds", with possible long-reaching consequences for the origin of chemical elements relevant for life".

By introducing the theory of red giant, the author intends to ______

A．explain-the possible way of death of our Sun.

B．show the two types of red giants.

C．discuss on the way of red giants to become white dwarfs.

D．explore the origin of life.

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第10题

Which of the following is true according to the first two paragraphs？ A．Women are

Which of the following is true according to the first two paragraphs？

A．Women are biologically more vulnerable to stress.

B．Women are still suffering much stress caused by men.

C．Women are more experienced than men in coping with stress.

D．Men and women show different inclinations when faced with stress.

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