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
To use chemicals and fertilizers means ______.
A．to increase the amount of foods
B．to increase the quality of foods
C．to increase the amount and quality of foods
D．to increase essential vitamins and minerals
单项选择题
The Christmas tree first set up in Britain was in ______.
A．1776
B．1841
C．1933
D．1843
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