单项选择题

Questions 16 to 20 are based on the following talk.

A．Because patients may not be able to afford the $ 300 price tag.
B．Because it cannot stop the grinding or clenching.
C．Because it cannot protect the teeth.
D．Because it will damage the arrangement of the teeth.
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单项选择题
A．The pictures taken by instamatic cameras are not true.B．Photographers may not be professional enough to catch real moments of our lives.C．Children often pretend to be lovely and smiling while posing for a photographer.D．There is something missing from the family album.
A．The pictures taken by instamatic cameras are not true.
B．Photographers may not be professional enough to catch real moments of our lives.
C．Children often pretend to be lovely and smiling while posing for a photographer.
D．There is something missing from the family album.
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