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
According to the passage, alcohol has something to do with bad breath mainly because ______.
A．it keeps offending bacteria from reproducing
B．its smell adds to bad breath
C．it kills some helpful bacteria
D．it affects the normal flow of saliva
单项选择题
According to this passage, various types of packaging come into existence to ______.
A．meet the needs of consumers
B．suit all kinds of products
C．enhance the market position of products
D．introduce new products
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