单项选择题

A．Because their value has been raised since they were made.
B．Because they contain more silver than they used to.
C．Because they contain less silver than they should do.
D．Because the metal wears down in use.
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单项选择题
A．Swimming.B．Playing tennis.C．Boating.D．Playing table tennis.
A．Swimming.
B．Playing tennis.
C．Boating.
D．Playing table tennis.
单项选择题
A．A big noiseB．A strange noiseC．A stranger’’s noiseD．A child’’s noise
A．A big noise
B．A strange noise
C．A stranger’’s noise
D．A child’’s noise
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