单项选择题

Which of the following is mentioned as one of the causes of bad breath

A．Tooth trouble
B．Sulfur-rich food
C．Too much exercise
D．Mental Strain
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单项选择题
The word undue (Line 2. Par
A．2) means" ______.".A. improperB. adequateC. unexpectedD. excessive
单项选择题
Consumers are concerned about the changes in package size, mainly because ______.
A．they hate to see any changes in things they are familiar with
B．the unit price for a product often rises as a result
C．they have to pay for the cost of changing package sizes
D．this entails an increase in the cost of packaging
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