单项选择题

Questions 13 to 15 are based on the conversation you have just heard.

A. How to care for precious metals. B. A standard unit for measuring weight.
C. The value of precious metals.D. Using the metric system.
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单项选择题
A. 4 children. B. 4.2 children.C. 2.4 children. D. 2 children.
A. 4 children.
B. 4.2 children.
C. 2.4 children.
D. 2 children.
单项选择题
A. Hot during the day and cold at night.B. Cold during the day and hot at night.C. Hot day and night.D. Cold day and night.
A. Hot during the day and cold at night.
B. Cold during the day and hot at night.
C. Hot day and night.
D. Cold day and night.
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