单项选择题

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
The Indonesian province of Aceh and the eastern coast of Sri Lanka were poor and war-torn before the tsunami struck.
A．Y
B．N
C．NG
单项选择题
A．Because men are seldom seen in the forest.B．Because tigers are afraid of something.C．Because men are not edible.D．Because men shout aloud.
A．Because men are seldom seen in the forest.
B．Because tigers are afraid of something.
C．Because men are not edible.
D．Because men shout aloud.
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