题目内容

It is generally accepted that________boy must learn to stand up and fight like________man.

A．a；a B．a；the C．the；the D．a；/

 

A

【解析】答案　A　[考查冠词的用法。句意：人们普遍认为， 男孩子必须学会做一个男子汉，能挺身而出，勇于战斗。a boy和 a man都是泛指，表示一类人。单数可数名词泛指应在名词前加不定冠词a。因此选A。]

 

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________on a clear day，far from the city crowds，the mountains give him a sense of peace.

A．Walked B．To walk

C．Having walked D．When he is walking

 

Mr. Smith __________ the accident，but his wife died and he __________ her by five years.

A．survived from；survived B．survived of；lived

C．survived；survived D．survived；lived

 

Peter took advantage________ his visit to Paris to improve his French.

A．on B．at C．with D．of

 

Against the supposition than forest fires in Alaska, Canada and Siberia warm the climate, scientists have discovered that cooling may occur in areas where burnt trees allow more snow to mirror more sunlight into space.

This finding suggests that taking steps to prevent northern forest to limit the release of greenhouse gases may warm the climate in northern regions. Usually large fires destroyed forests in these areas over the past decade. Scientists predict that with climate warming, fires may occur more frequently over next several centuries as result of a longer fire season. Sunlight taken in by the earth tends to cause warming, while heat mirrored back into space tends to cause cooling.

This is the first study to analyze all aspects of how northern fires influence climate. Earlier studies by other scientists have suggested that fire in northern regions speed up climate warming because greenhouse gases from burning trees and plants are released into the atmosphere and thus trap heat.

Scientists found that right after the fire, large amounts of greenhouse gases entered the atmosphere and caused warming. Ozone(臭氧)levels increased, and ash from the fire fell on far?off sea ice, darkening the surface and causing more radiation from the sun to be taken in. The following spring, however, the land within the area of the fire was brighter than before the fire, because fewer trees covered the ground. Snow on the ground mirrored more sunlight back into space, leading to cooling.

“We need to find out all possible ways to reduce the growth of greenhouse gases in the atmosphere.” Scientists tracked the change in amount of radiation entering and leaving the climate system as a result of the fire, and found a measurement closely related to the global air temperature. Typically, fire in northern regions occurs in the same area every 80 to 150 years. Scientists, however, found that when fire occurs more frequently, more radiation is lost from the earth and cooling results. Specifically, they determined when fire returns 20 years earlier than predicated, 0.5 watts per square meter of area burned are soaked_up by the earth from greenhouse gases, but 0.9 watts per square meter will be sent back into space. The net effect is cooling. Watts are used to measure the rate at which energy is gained or lost from the earth.

1.According to the new findings, taking steps to prevent northern forest fires may ________.

A．result in a warming climate

B．cause the forest fires to occur more frequently

C．lead to a longer fire season

D．protect the forests and the environment there

2.The following are all the immediate effects after a forest fire EXCEPT________.

A．large amounts of greenhouse gases enter the atmosphere

B．the levels of ozone which is a type of oxygen increase

C．snow on the ground mirrors more sunlight back into space

D．ashes from the fire fall on the ice surface and take in more radiation from the sun

3.Earlier studies about northern forest fires ________.

A．analyze all aspects of how northern fires influence climate

B．indicate that forest fires will pollute the atmosphere

C．suggest that people should take measures to protect environment

D．suggest that the fires will speed up climate warming

4.The underlined phrase “soak up” in the last paragraph most probably means ________.

A．released B．absorbed C. created D．distributed

 

As is known to all，________life in ________ modern world is easier in some ways than ________ life our grandparents lived.

A．the；a；the B．a；the；the

C．/；the；the D．the；/；the

 

Understanding the cultural habits of another nation，especially ________containing as many different cultures as America，is a difficult thing.

A．the one B．one C．it D．either

 

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A．Four fifth; believes B．Four fifth; believe

C．Four fifths; believe D．Four fifths; believes

 

We live in an age________many things are done on computer.

A．which B．that C．whose D．when

 

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