单项选择题

The word "assert" (line 4, paragraph 3) might mean______.

A．refute
B．declare
C．deny
D．cite
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单项选择题
The explosion of the Challenger Space Shuttle is mentioned to show that______.
A．technology is always unreliable
B．man should be responsible for the technology created by it
C．man is losing control of such technology
D．human beings should not create such technology
单项选择题
The author's attitude towards directed research is
A．admiring it
B．questioning it
C．contempting it
D．praising it
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