单项选择题

The megaphone makes the voice sound louder because it points sound waves in one direction and keeps them from spreading out in all directions.

A．slithering
B．radiating
C．interfering
D．murmuring
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单项选择题
All living organisms, regardless of their unique identity, have certain biological, chemical, and physical characteristics in common.
A．as a result of
B．considering
C．cognizant of
D．whatever
单项选择题
Thomas Fuller was so skilled at mathematics that he was known in the eighteenth century as the Virginia Calculator.
A．fascinated by
B．articulate about
C．proficient in
D．suspicious of
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