单项选择题

According to the last paragraph, if changes are called for, some manufactures are more willing to change ______.

A．the image of a product
B．the function of a product
C．the quality of a product
D．the price of a product
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单项选择题
According to the passage, a designer of products is pre occupied with the following problems EXCEPT ______.
A．customer appeal
B．man-hour
C．machine tolerance
D．stress factors
单项选择题
The author fears that if adults always correct mistakes for children, children will grow up to be ______.
A．fearful of making mistakes
B．too critical of themselves
C．unable to think for themselves
D．unable to use basic skills
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