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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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There could be life on the Mars in the future if()

A. it supported life in the past
B. certain gases are used to cool the planet
C. the atmosphere can be heated enough to grow simple plants
D. the planet’s volcanoes become as active as they were in the past

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25()

A. tall
B. short
C. long
D. length

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Why blue lights are installed in many train stations()

A. Because they do not hurt human eyes.
Because they are cheaper than regular ones.
C. Because they can help people at night.
D. Because they can reduce the number of suicides.

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股票分割对公司的资本结构不会产生任何影响，一般只会使发行在外的股票总数增加，资产负债表中股东权益各账户(股本、资本公积、留存收益)的余额都保持不变，股东权益的总额也保持不变。 ( )

A. 对
B. 错

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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

There could be life on the Mars in the future if()

25()

Why blue lights are installed in many train stations()

股票分割对公司的资本结构不会产生任何影响，一般只会使发行在外的股票总数增加，资产负债表中股东权益各账户(股本、资本公积、留存收益)的余额都保持不变，股东权益的总额也保持不变。 ( )

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