3.Which of the following is true about the previous generations of wireless standards?
A.It took a long time to develop the previous generations.
B.The previous generations users think highly of the systems.
C.There were only few isolated and shortsighted changes in them.
D.It is difficult to imagine the future of the wireless standards.
答案:C [事实细节题。根据第二段的最后一句的后半部分“rather than the kinds of isolated and shortsighted pushes that resulted in previous generations of wireless standards”可知4G以前的几代无线电标准都是在原来的基础上作了孤立的、目光短浅的改进。据此,我们可以得出本题的答案。]
4.What is the most significant advantage of the “4G” systems?
A.Users will be able to catch more signals from all over the world.
B.It will be much cheaper to use the “4G” communication systems.
C.It will be much faster for data to transfer with the help of the
“4G” systems.
D.Users will be able to jump from one network to another.
答案:C [推理判断题。根据第三段的第二句和第三句我们可以知道,与2G和3G相比,4G最重要的改变是在数据传输速度方面。在以前的2代、3代通讯技术改进的过程中,只是经过了一些细小的改进,数据的传送速度也只提高了每秒几千个字节。而第4代技术则提高了每秒几个兆比特的速度。四个选项中A项内容在文章中找不到根据;B项,文章也没有从价格方面谈论4G的优势;D项具有一定的迷惑性,从第三段最后一句可知“从一个网络转到另一个网络”是4G出现的问题,故D项也不对。]
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