单项选择题

A．The visiting economist has given several lectures.
B．The guest lecturer’’s opinion is different from Dr. Johnson’’s.
C．Dr. Johnson and the guest speaker were schoolmates.
D．Dr. Johnson invited the economist to visit their college.
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单项选择题
The author implies that ________.
A．products are more expensive in the U.S. than anywhere else
B．credit cards are often used illegally
C．products very often do not perform as advertised
D．most Americans like to buy what they cannot afford
单项选择题
We can infer from this passage that ______.
A．offensive breath can’’t easily be cured
B．elderly people are less offended by bad breath
C．heavy drinkers are less affected by bad breath
D．offensive breath is less affected by alcohol
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