单项选择题

A．90% copper and 10% silver.
B．90% silver and 10% copper.
C．90% silver, 9% copper, and 1% lead.
D．None of these.
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单项选择题
This passage is concerned mostly with ________.
A．the free enterprise system in America
B．the difficulty of living on a fixed income
C．innovative techniques in food processing
D．the advances of advertising techniques
单项选择题
A．She is going to Finland.B．She has visitors next week.C．She has guests at her home.D．She has just visited him this week.
A．She is going to Finland.
B．She has visitors next week.
C．She has guests at her home.
D．She has just visited him this week.
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