单项选择题

It is significant that nowadays ______ considered to be an important part of a healthy diet.

A．vegetables are
B．white bread is
C．fibre is
D．unrefined flour is
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单项选择题
Chickens kept in this way are not only tasteless as food, they also produce eggs which ______.
A．lack important fibres
B．lack important protein
C．lack important minerals
D．lack important vitamins
单项选择题
In many homes the symbol of the spirit of Christmas is ______.
A．the Christmas tree
B．the Christmas song
C．the Christmas card
D．the Christmas present
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