单项选择题

According to the passage, some managers don’t have to do any letter writing because ()

A. they rely on quick notes
B. they have a computer to do it
C. they have excellent secretaries
D. they prefer making phone calls

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单项选择题In order to make it stronger, gold is often mixed with()

A. hard gold
B. coin and jewelry
C. acids
D. other metals

单项选择题Faulkner’s research findings are based on ()

A. a survey of farmers in northern Japan
B. tests performed on a thousand old people
C. the study of brain volumes of different people
D. the latest development of computer technology