The National Gallery of Art in Washington，D.C.is one of the world's greatest art museums.Millions of people have entered its doors to see paintings by the world's fine artists.But if these priceless masterpieces are to be kept，the Gallery must protect them carefully.The Gallery's 135-man guard force has successfully prevented them from being stolen，but protecting the paintings from nature is a greater problem.
In past times，the owners of paintings did not protect them from damaging changes in humidity and temperature.As a result，the life-spans of these paintings were shortened.In the National Gallery，however，humidity and temperature are carefully controlled.The building is cooled in summer and heated in winter.The ar-cooling and heating systems are so important to the life of the paintings that the Gallery has two of each system.If one fails，the extra one can take over.
▲ .Long ago，paintings were often hung in dark churches and palaces with a coat of varnish outside which was a protection from weak light.But when many painting were moved to museums，they were often hung in brighter light than before.What's even worse，the coat of varnish was removed for better showing.Soon the paintings were in danger of fading.The paper yellowed with age.The color of these artworks was no longer bright.
To protect its paintings，the National Gallery put a special kind of glass in its windows.This glass allows visible lights to enter the building but it keeps out harmful ultraviolet rays.The Gallery has also developed new and better varnishes which help to keep paintings from fading.Thanks to these new precautions，many of the world's greatest paintings are being kept for future generations to enjoy.
（1）We can learn from Paragraph 2 that BB.
A．the Gallery is heated in winter to attract more visitors
B．it's necessary to control the temperature in the Gallery
C．the paintings were well protected by owners in the past
D．the air-conditioning and heating systems fail quite often'
（2）Which of following sentences can be put in the ▲ in Paragraph 3？ AA
A．Light is another enemy of paintings
B．Paintings are easy to lose bright colors
C．Museums are good places to store paintings
D．People found a new way to protect paintings
（3）The underlined word " precautions " in Paragraph 4 means " BB "
A．artists
B．methods
C．suggestions
D．decorations
（4）What is the passage mainly about？ DD
A．The effort to protect paintings from being stolen.
B．The introduction of the world's greatest art museum.
C．The environmental conditions in the National Gallery.
D．The protection of paintings from environmental influence.
【答案】B；A；B；D
【解答】
【點評】
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發(fā)布：2024/5/6 8:0:9組卷：3引用：1難度：0.5
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