单项选择题

The passage tells us that proof of life on Mars would ______.

A．make clear the complex chemistry in the development of life
B．confirm the suggestion that bacterial fossils travelled to Earth on a meteorite
C．reveal the kind of conditions under which life originates
D．provide an explanation why life is common in the universe
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单项选择题
Today's corporate executive officers resemble the industrialists and agriculturists in the past in their realization of ______.
A．the essential roles of the workers in turning out more products
B．the importance of information to a company's development
C．the importance of technology leading to high employee productivity
D．the necessity of providing employees with a comfortable environment
单项选择题
What is the main goal of sending human missions to Mars
A．To find out if life ever existed there.
B．To see if humans could survive there.
C．To prove the feasibility of large-scale space ventures.
D．To show the leading role 6f science in space exploration.
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