成人英语三级

单选题 Scientists use software rather than hardware in their experiments because__________．

A．it can avoid redesigning computer chips
B．it can save a lot of time and money
C．it can avoid making mistakes
D．it is more like the human brain

参考答案：B进入在线模考
细节判断题。从最后一句By experimenting with different approaches through software rather than hardware，scientists have been able to avoid costly mistakes可以得知，用软件能够避免一些会导致重大损失的错误。costly，“昂贵的，代价高的”，avoid costly mistakes也就是指能够节约钱和时间，而不是避免所有错误(故选项C错误)，答案选B。

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1根据下面资料，回答题
Broadband technology is seen as the key to the new digital economy． In this rapidly changing world, media and technology information can be sent via phone calls and downloads like music, graphics, business information or films． The simpler the information, the smaller the package and the narrower the bandwidth needed to deliver it．
Broadband is used for high speed Internet connections at a fixed monthly rate． It turns an existing telephone line into a high speed digital line capable of carrying data up to 40 times conventional modem speeds． Any download is available at the click of a mouse—there is no dial-up as there is with standard Internet Service Providers． For home owners and fam-ilies there are many advantages． One of the most important is simultaneous (同时的) access to both telephone lines and the Internet． No queues and no delay． For businesses,broadband can improve customer relations and provide direct access to corporate e-mails and databases．
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2How much does a user pay if he has broadband technology installed?

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3 Compared with the modem speed the broadband technology can transmit data__________．

A．at up to forty times of ordinary speed
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