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【单选题】
根据以下资料,回答20~23题。 At the first sight the planet Mars does not appear very welcome to any kind of life.It has very little oxygen and water, the temperature at night is below -50~Cand winds of 100 miles per hour cause severe dust storms.However, the surface of the planet seems to show that water flowed across it some time in the past, and it is believed that there is enough ice at the poles to cover the planet with water if it melts.Although there is no life on the Mars now, some scientists think that there may have been some form. of life long time ago.At that time, the planet had active volcanoes the atmosphere was thicker and warmer and there was water.In fact, in some ways the Mars may have been similar to the Earth, where life exists. Some people believe that the Mars could support life in the future if the right conditions were produced.The first step would be to warm the planet using certain gases which trap the Sun's heat in the planet's atmosphere.With warmth, water and carbon dioxide (二氧化碳), simple plants could begin to grow.These plants could slowly make the Mars more suitable for living.It is estimated that the whole process might take between 100,000 and 200,000 years.In the meantime, people could begin to live on the planet in special closed environments.They would provide a lot of useful information about conditions on the Mars and the problems connected with living there. Some scientists think there may have been life on the Mars in the past because __.
A.
there is no life there now
B.
there is a large amount of water at the poles
C.
the Mars may be able to support life in the future
D.
conditions may have been similar to those on the Earth
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举一反三
【单选题】It is widely accepted that the cultural industry has been one of the key industries in developed countries.
A.
发达国家广泛接受,文化是支撑国家工业发展的关键事业。
B.
发达国家已普遍接受,文化产业应看成一种关键性的事业。
C.
大家普遍接受,发达国家应把文化事业看成一种关键产业。
D.
人们普遍认为,文化产业已成为发达国家的一个支柱产业。
【单选题】At first Mr. Sally was ______ of planes, but two years later, ______ to other countries on business is his main business.
A.
scared; flying
B.
frightening; flight
C.
frightened; flight
D.
scaring; flying
【单选题】The second book was ___ by August 1982, but two years later, the end was still nowhere in sight.
A.
completed
B.
to have completed
C.
to complete
D.
to have been completed
【简答题】小张缴纳保险费6年后失业了,那么按现行制度规定,可领取失业保险金的最长期限为()。
【判断题】食用菌具有高蛋白、低脂肪、低胆固醇的特点。
A.
正确
B.
错误
【单选题】以下网络不可以在Windows 7操作系统中进行设置的是( )。
A.
家庭网络
B.
小区网络
C.
工作网络
D.
公共网络
【单选题】It is widely accepted that the cultural industry has been one of the key industries in developed countries.
A.
发达国家已普遍接受,文化产业应看成一种关键性的事业。
B.
大家普遍接受,发达国家应把文化事业看成一种关键文化。
C.
人们普遍认为,文化产业已成为发达国家的一个支柱产业。
【单选题】It is widely accepted that the cultural industry has been one of the key industries in develooped countries.
A.
发达国家广泛接受,文化是支撑国家工业发展的关键事业。
B.
发达国家已普遍接受,文化产业应看成一种关键性的事业。
C.
大家普遍接受,发达国家应把文化事业看成一种关键产业。
D.
人们普遍认为,文化产业已成为发达国家的一个支柱产业。
【单选题】The second book was( ) by August 1952, but two years later, the end was still nowhere in sight.
A.
completed
B.
to have completed
C.
to complete
D.
to have been completed
【单选题】小张缴纳保险费6年后失业了,那么按现行制度规定,可领取失业保险金的最长年限为( )。
A.
12 个月
B.
18个月
C.
24个月
D.
36个月
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