单项选择题

What does the news cover

A．Celebrations of the Independence Day.
B．Observations on traditional holidays.
C．Community activities on holidays.
D．America's road to independence.
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单项选择题
When will people probably be able to live on Mars
A．In 200 years.
B．In 10,000 years.
C．In 100,000 years.
D．Unknown.
单项选择题
What is one of the things that must be done before man can live on Mars
A．Its surface must be studied.
B．Its temperature must be raised.
C．Big spaceships must be built.
D．Its air must be purified.
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