单项选择题

Questions 18 ～ 21 are based on the following dialogue on a reading list. What is Helen’s major

A．Children’s Literature.
B．American Literature.
C．Medicine.
D．Elementary Education.
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单项选择题
What does the telegram say
A．Return immediately for his parents missed him badly.
B．Return immediately for his aunt is expecting him.
C．Return immediately for something unusual happened at home.
D．Return immediately for his uncle was seriously ill at home.
单项选择题
As pointed out at the beginning of the passage, people used to think that air pollution ______.
A．caused widespread damage in the countryside
B．affected the entire eastern half of the United States
C．had damaged effect on health
D．existed merely in urban and industries areas
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