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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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
单项选择题
The word undue (Line 2. Par
A．2) means" ______.".A. improperB. adequateC. unexpectedD. excessive
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