单项选择题

There are thirty sentences in this section. Beneath each sentence there are four words or phrases marked A, B, C and D. Choose one word or phrase that best completes the sentence.
Mark your answers on your answer sheet.
The pressure ______ causes Americans to be energetic, but it also puts them under a constant emotional strain.

A．to compete
B．competing
C．to be competed
D．having competed
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单项选择题
According to some politicians and scholars, senior citizen discounts will _______.
A．make old people even more dependent on society
B．intensify conflicts between the young and the old
C．have adverse financial impact on business companies
D．bring a marked increase in the companies’ revenues
单项选择题
Which of the following is the closest in meaning to the word artillery as used in paragraph 2
A．Large weapons such as cannons.
B．Small weapons such as pistols.
C．Shoulder weapons such as rifles.
D．Tension weapons such as crossbows.
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