2. 职称英语
  3. But cellphones had been around for 15 years before they caught on with______Amer

But cellphones had been around for 15 years before they caught on with______Amer

游客2025-05-07  45
问题 But cellphones had been around for 15 years before they caught on with______America. By that yardstick, broadband-widely available for only the past couple of years-has many more miles to go.
选项 A、main-topmast
B、mainstay
C、main artery
D、mainstream
答案 D
解析 本题的四个选项中，main—topmast意为“主中桅”；mainstay意为“支柱，中流砥柱”；main artery意为“主要干线”；mainstream意为“主流”。本题的句意是：在无线电话受美国主流青睐之前已经存在约有15年了。按照那种标准，人们广泛使用宽带才只有几年，所以它的发展还有很长的路要走。因此正确答案是D项。
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