单项选择题

From the passage, we can know inflation ______.

A. seldom happens
B. is very common at present

C. is a must
D. has become less in recent yearn
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单项选择题
All of the following statements are true EXCEPT ______.
A. 80% of cancer is caused by problems related to food
B. researchers have known about the potential danger of food additives for many years
C. we eat some of the food additives directly and some indirectly
D. drugs are always given to animals for medicinal purposes
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