More people than ever are drinking coffee these days—but in smaller quantities than they used to. Some manufacturers of coffee m

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问题     More people than ever are drinking coffee these days—but in smaller quantities than they used to. Some manufacturers of coffee makers are trying to take advantage of this trend by developing diminutive machines that brew(冲泡)smaller amounts of coffee.
    Two US appliance companies—Black & Decker, based in Towson, Maryland, and Toastmaster Inc. of Columbia, Missouri—have recently introduced "drip"coffee makers that brew one or two cup servings of coffee. Both of the products brew the coffee directly into a cup or mugs, eliminating the need for a separate carafe. Since many people make a pot of coffee in the morning but drink only a single cup, the new coffee makers should reduce the wasted coffee. Black & Decker’s Cup-at-a-Time costs $ 27, while Toastmaster’s Coffee Break Retails for $ 20.
    Black & Decker also makes a coffee maker that drips coffee directly into a carry-around thermal carafe. The carafe, a glass vacuum bottle, is supposed to keep the coffee fresh for hours. The product, called the Thermal Carafe Coffee-maker, comes with a built-in lid that opens during the brewing process and closes when it is completed. There are several models, including one that first under the counter, ranging from $ 60 to $ 110 in prices.
The advantage of" drip "coffee makers shown in the passage is that( ).

选项 A、they are much more economic
B、they are more economical
C、they produce only one cup of coffee
D、they are more convenient to operate

答案B

解析
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