单项选择题

The advantage of "drip" coffee makers shown in the text is that ______.

A．they are much more economic
B．they can produce only one cup
C．they are more economical
D．they are more convenient and easier to operate
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单项选择题
According to the passage, a thermal carafe is necessary when the coffee is ______.
A．preserved
B．produced
C．manufactured
D．brewed
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