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
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单项选择题
Which of the following statements is TRUE
A．Living mechanisms are always more efficient than their artificial imitations.
B．Bats rely on their sonar system as well as eyesight to eat insects.
C．The sonar system of bats has had 50 million years to be refined.
D．People have discovered the bats' sonar system thousands of years ago.
单项选择题
Lazure Spallanzani demonstrated that a bat can get along well without eyesight through ______.
A．he caught some bats and blinded them and released them
B．four of these blind bats found their way back
C．he recaptured the four returned bats
D．the stomachs of the blind bats found to be filled with flying insects
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