单项选择题

The author's attitude towards intelligent seem to be that_____.

A．opposition
B．approval
C．suspicion
D．indifference
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单项选择题
What have given mankind a new viewpoint on the earth and its neighbors in space
A．Those explorations.
B．The advance of new technologies.
C．Spacecraft studies.
D．Scientific discoveries.
单项选择题
What are the challenges of space exploration
A．The challenge was developing rockets powerful enough and reliable enough to boost a satellite into orbit.
B．The challenge was building the satellites themselves.
C．Engineers also had to build tracking stations to maintain radio communications with these artificial "moons" as they circled the planet.
D．The development of rockets and satellites.
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