单项选择题

A．A standard unit for measuring weight.
B．How to care for precious metals.
C．The value of precious metals.
D．Using the metric system.
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填空题
When an earthquake occurs, people must run to open ground or stay in safe areas like _______________.
单项选择题
A．She hasn’t cleaned her room either.B．She left her room on time this morning.C．She can help the man clean up his room.D．She doesn’t know the mess the man have made in her room.
A．She hasn’t cleaned her room either.
B．She left her room on time this morning.
C．She can help the man clean up his room.
D．She doesn’t know the mess the man have made in her room.
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