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

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单项选择题

The kind of exams where students must select answers are()

A. personal
B. spoken
C. objective
D. written

单项选择题

38()

A.are
B.is
C.have
D.has