单项选择题


Questions 22 to 25 are based on the conversation you have just heard.

A．How to measure metals.
B．A standard unit for measuring weight.
C．The price of precious metals.
D．How to use the metric system.
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填空题
The purpose of the passage is to provide different ways for people to tackle the state of extreme pressure or strain.
单项选择题
A．Because the shape of snow crystal(晶体) is still a mystery for experts.B．Because the snowfall is a blessing for human beings.C．Because experts have different ideas about the formation of snowflakes.D．Because it is not easy to judge the time or place of snowfall.
A．Because the shape of snow crystal(晶体) is still a mystery for experts.
B．Because the snowfall is a blessing for human beings.
C．Because experts have different ideas about the formation of snowflakes.
D．Because it is not easy to judge the time or place of snowfall.
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