未知题型
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 convenient and easier to operate
D.they are more economical
- A.A.they
B.they
C.they
D.they
【参考答案】
D
解析：细节题。通过题干回到文章中相应的位置可知答案。见文章第二段第三句：Since many people ......
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