单项选择题

More than 13,000 McDonald's restaurants in America will use a new kind of cooking oil to ______.

A．lower the costs of the products
B．make its food taste better than ever before
C．cure the heart disease
D．do good to the health of consumers
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单项选择题
The underlined word switching in Paragraph 5 probably means ______.
A．losing
B．spending
C．changing
D．studying
单项选择题
The main idea of the text is ______.
A．McDonald's is a pioneer in food products
B．McDonald's is enlarging its restaurants in the world
C．fried foods can't keep up with the development of moden society
D．McDonald's is to use new cooking oil
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