单项选择题

"Sound", as defined by the psychologist,______.

A．can be measured in the same way that "noise" is measured
B．may be extremely harmful to health
C．is not at all different from "noise"
D．can be measured by machines
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单项选择题
People enjoy listening to music,______.
A．though they are receiving a lot of decibels of sound in fact
B．because it does not have any negative effect
C．because they do not have to tolerate the noise around them
D．even though it is sometimes unpleasant hearing strange sounds
单项选择题
What is the main idea of the passage
A．The Declaration of Independence and the French Revolution.
B．The Declaration of Independence's influence on other countries.
C．The Application of the Declaration of Independence by different people.
D．The different purposes of the Declaration of Independence intended by its authors.
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