单项选择题

This passage is mainly about ______.

A．living mechanisms and their artificial imitations
B．the remarkable sonar system of bats
C．the deficiencies of man-made sonars
D．the experiment of "blind-bats"

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单项选择题

What does the author imply when he mentions living cells in Paragraph 3

A．The research has involved living creatures.
B．The results from the lab test might not always be reliable.
C．If it is tested in living body, the results will be the same.
D．The chemistry of VC is livin

单项选择题

Which of the following statements is NOT TRUE about the scientists' research

A．The scientists experimented with VC in test tubes.
B．The research didn' t involve people.
C．VC was tested in the lab only.
D．Mark Levine did the experiment involving peopl