单项选择题

Some shoppers are not satisfied with the new machine because ______.

A．it makes so many mistakes
B．they can't read the coded prices themselves
C．they waste a lot of time shopping
D．sometimes it is not reliable
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单项选择题
The main idea of this passage is that ______.
A．supermarkets are becoming more and more popular
B．computers find use in supermarkets
C．a new way of checking out in supermarkets
D．people are not used to the new machine
单项选择题
What is the wind energy capacity of Germany in 1998
A．600 megawatts.
B．800 megawatts.
C．2,100 megawatts.
D．2,800 megawatts.
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