单项选择题

W: MacDonald Company... Can I help you?
M: I’d like to speak to Mr. Walker, please.
Q: What is the woman?（）

A．A shop assistant.
B．A secretary.
C．A company manager.
D．A waitress.

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单项选择题
W：Stella looks worried.She hasn’t heard from her family for quite some time.M：Why didn’t she call her parents？Overseas mail is often slow.Q：What does the man suggest？（）

A．Stella should go home immediately.
B．Stella should not worry about her family.
C．Stella should write home more frequently.
D．Stella should phone her family.
单项选择题
评价一个计算机系统时，通常使用(1)来衡量系统的可靠性，使用(2)来衡量系统的效率。
A.平均响应时间
B．平均无故障时间(MTBF)
C．平均修复时间
D．数据处理效率
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