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
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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
单项选择题
The author is critical mainly of ______.
A．dishonest packaging
B．inferior packaging
C．the changes in package size
D．exaggerated illustrations on packages
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