单项选择题

Which of the following activities must consider climate as an important factor

A．Microelectronics.
B．Communications.
C．Banking.
D．Farmin
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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"
单项选择题
Bats find insects in the dark of night with the help of ______.
A．echoes
B．eyesight
C．sound waves
D．none of the above
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