单项选择题

Questions 22-25 are based on the following passage. What about the yearly income of the average family from 1950 to 19757

A．Decreased.
B．Fluctuated.
C．Did not change at all.
D．Increased.
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单项选择题
What is the speaker’s purpose in giving this talk
A．To show how simple the mechanical aids for diving can be.
B．To provide an excuse for his changeable character.
C．To explore the philosophical issues of space travel.
D．To explain why he took up underwater exploration.
单项选择题
What does the woman think of the new drug
A．It can help solve complex problems.
B．It will most likely prove ineffective.
C．It is a new weapon against terrorists.
D．It will help detect all kinds of liars.
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