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Just as a famous Chinese saying goes, a timely heavy snow is a ______ of good harvest next year.

A．mark

B．track

C．sign

D．appearance

 

【答案】

C

【解析】略

 

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SEE a cell phone cover that you like on Taobao? Forget about placing an order, paying the bill online and waiting for days for it to be delivered to you. In the near future, you'll be able to get it in minutes just by hit­ting "print" on your computer.

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This may sound like a completely new technology, but the truth is that 3-D printing has been around since the late 1980s. Back then, it was barely affordable for most people, so few knew about it.

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4.What is the best title of the passage?

A．Printing out everything                   B．Technology in the future

C．Online shopping disappearing              D．Great demand for 3-D printers

 

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