We were driving along the village of Simdara. I?36...

第1题

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

apons and the discovery of fire, although nobody knows exactly when he acquired the use of the_______

A．latter

B．latest

C．later

D．last

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第2题

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

apons and the discovery of fire, although nobody knows exactly when he acquired the use of the ______.

A．latter

B．latest

C．later

D．last

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第3题

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

apons and the discovery of fire,although nobody knows exactly when he acquired the use of the____.

A．latter

B．latest

C．later

D．last

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第4题

A vacuum is initially established in the first and second stages of a low pressure evapora

tor by the use of __.

A.vacuum drag from the auxiliary condensate system

B.individual vacuum pumps

C.a single non-condensing air ejector

D.a two stage air ejector

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第5题

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

apons and the discovery of fire, although nobody knows exactly when he acquired the use of the______.

A．latter

B．latest

C．later

D．last

点击查看答案

第6题

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

imitive weapons and the discovery of fire, al though nobody knows exactly when 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 day (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 practiced. (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7题

When you first drift off into slumber, your eyes will roll about a bit, your temperature w

ill drop slightly, your muscles will relax, and your breathing will become quite regular. Your brain waves slow down a bit, with the alpha rhythm predominating for the first few minutes. This is the first stage of sleep. For the next 30 minutes or so, you will drift down through Stage 2 and Stage 3. The lower your stage of sleep, the slower your brain waves will be. About 40-60 minutes after you lose consciousness, you will reach the last stage. Your brain waves will show the delta rhythm. You may think that you stay at this deep stage all the rest of the night, but that turns out not to be the case. About 80 minutes after you fall into slumber, your activity cycle will increase slightly. The delta rhythm will disappear, to be replaced by the activity pattern of brain waves. Your eyes will begin to dart around under your closed eyelids. This period of Rapid Eye Movements lasts for 8-15 minutes and is called REM sleep.

During both light and deep sleep, the muscles in your body are relaxed but capable of movement. As you slip into REM sleep, a very odd thing occurs -- most of the voluntary muscles in your body become paralyzed. Although your brain shows very rapid bursts of neural activity during REM sleep, your body is incapable of moving. REM sleep is accompanied by extensive muscular inhibition.

On the part of an average sleeper, there______of sleep in cycles.

A．is one stage

B．are two stages

C．are six stages

D．are four stages

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第8题

When you first drift off into slumber, your eyes will roll about a bit, your temperature w

ill drop slightly, your muscles will relax, and your breathing will become quite regular. Your brain waves slow down a bit, with the alpha rhythm predominating for the first few minutes. This is the first stage of sleep. For the next 30 minutes or so, you will drift down through Stage 2 and Stage 3. The lower your stage of sleep, the slower your brain waves will be. About 40-60 minutes after you lose consciousness, you will reach the last stage. Your brain waves will show the delta rhythm. You may think that you stay at this deep stage all the rest of the night, but that turns out not to be the case. About 80 minutes after you fall into slumber, your activity cycle will increase slightly. The delta rhythm will disappear, to be replaced by the activity pattern of brain waves. Your eyes will begin to dart around under your closed eyelids. This period of Rapid Eye Movements lasts for 8-15 minutes and is called REM sleep.

During both light and deep sleep, the muscles in your body are relaxed but capable of movement. As you slip into REM sleep, a very odd thing occurs -- most of the voluntary muscles in your body become paralyzed. Although your brain shows very rapid bursts of neural activity during REM sleep, your body is incapable of moving. REM sleep is accompanied by extensive muscular inhibition.

On the part of an average sleeper, there______of sleep in cycles.

A．is one stage

B．are two stages

C．are six stages

D．are four stages

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第9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10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 he acquired the use of the latter.

The 【C1】______ of language is also obscure (模糊). No doubt it began very. 【C2】______ . Animals have a few 【C3】______ that "serve as signals, 【C4】______ even the highest apes have not been found able to 【C5】______ words, even with the most 【C6】______ professional instruction. The 【C7】______ brain of man is apparently a necessity for the 【C8】______ of speech. When man became 【C9】______ intel-ligent, we must 【C10】______ that he gradually 【C11】______ the number of cries for different purposes. It was a great day 【C12】______ he 【C13】______ that speech could be used for narrative. I am 【C14】______ to think that language has been the most important single 【C15】______ in the development of man.

Two important 【C16】______ came not so long before the dawn of written history. The first was the domestication(家庭驯养) of animals; the second was agriculture. Agriculture made possible an immense increase in the number of the human 【C17】______ in the regions where it could be successfully practiced.

Another fundamental technical 【C18】______ was writing, which, like spoken language, developed out of pictures, but as soon as it had reached a certain stage, it was possible to keep records and 【C19】______ information to people who were not 【C20】______ when the information was given.

【C1】

A．space

B．Origin

C．invention

D．copy

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