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
A．A New York executive.B．A computer specialist.C．A television announcer.D．A teacher.
A．A New York executive.
B．A computer specialist.
C．A television announcer.
D．A teacher.
单项选择题
A．Record of changes in his own intelligence.B．Work with people in different climates.C．Records of temperature changes.D．All records of changes in mental abilities.
A．Record of changes in his own intelligence.
B．Work with people in different climates.
C．Records of temperature changes.
D．All records of changes in mental abilities.
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