单项选择题

A．To show that high school students can be very shy.
B．To explain that blushing is a learned behavior.
C．To prove that blushing is not easily controlled.
D．To say that his shyness is more serious than hers.
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单项选择题
Tour operators try to cheat tourists.
A．Y
B．N
C．NG
单项选择题
Thank-you cards seem to become rare because___________.
A．interaction between people has been diminished than before
B．the etiquette of thank-you notes has become out of date
C．people have found better means of expressing their thanks
D．people have become forgetful in the new age
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