单项选择题

39()

A.families
B.homes
C.factories
D.offices

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单项选择题

According to the passage, the two students failed in their study because of their()

A. shyness
B. pride
C. self-doubt
D. laziness

单项选择题

The underlined term life expectancy (Para. 1) Refers to()

A. the length of time for each person
B. the expectations of a person’s life
C. the seasonal changes in a person’s life
D. the average period that a person may expect to live