（）are represented by phonetic symbols because there is no one-to-one correspondence between written letters and spoken sounds.

A . Provide common view of entire topology B . Exchange routing tables with neighbors. C . Calculates shortest path. D . Utilizes event triggered updates. E . Utilizes frequent periodic updates.

A . shared ephone-dn  B . overlaid ephone-dn  C . oual-line ephone-dn  D . single-line ephone-dn  E . dual-number ephone-dn  F . two ephone-dns with one number

A .  monochrome backlit display B .  full-duplex speakerphone C .  MP3 music player D .  dynamic softkeys E .  Bluetooth

A . 55 percent B . 56 percent C . 75 percent D . 85 percent

A．只有在网上报名或打电话800-700-60000预约，你才可以到许多商店领取礼品。 B．礼品卡可以通过互联网购买，或打电话800-700-60000购买，在很多商店也有售。 C．如果上网或拨打800-700-60000电话，你同样可以得到很多商店赠送的礼品。 D．礼品卡在所有网站和商店都有售，或可打电话订购，电话号码800-700-60000。

A．真 B．假 C．NOT GIVEN

A．A.connect with B．B.get in touch with C．C.communicate with D．D.have alink with

<img src='https://img2.soutiyun.com/shangxueba/ask/4281001-4284000/4281891/ct_ebecfrm_00002(20107).jpg' /> A．Wang B．Li C．Cheng

A．Thomas Edison B．Benjamin Franklin C．George Washington D．Steve Jobs

When our population is so small that all our labor can be engaged in the group represented by A, productivity of labor (and therefore wages) will be at their maximum. When our population increases so that some of the labor will have to be set to work in group B, the wages of all labor must decline to the level of the productivity in that group. But no employer, without government aid, will yet be able to afford to hire labor to exploit the opportunities represented by C and D, unless there is a further increase in population. But suppose that the political party in power holds the belief that we should produce every thing that we consume, that the opportunities represented by C and D should be exploited. The commodities that the industries composing C and D will produce have been hitherto obtained from abroad in exchange for commodities produced by A and B. The government now renders this difficulty by placing high duties upon the former class of commodities. This meads that workers in A and B must pay higher prices for what they buy, but do not receive higher prices for what they sell. After the duty has gone into effect and the prices of commodities that can be produced by C and D have risen sufficiently, enterprisers will be able to hire labor at the wages prevailing in A and B, and establish industries in C and D. So far as the remaining laborers in A and B buy the products of C and D, the difference between the price which they pay for those products and the price that they would pay if they were permitted to import those products duty-free is a tax paid not to the government, but to the producers in C and D, to enable the latter to remain in business. It is an uncompensated deduction from the natural earnings of the laborers in A and B. Nor are the workers in C and D paid as much, estimated in purchasing power, as they would have received if they had been allowed to remain in A and B under the earlier conditions. When C and D are established, workers in these industries______. A．receive higher wages than do the workers in A and B B．receive lower wages than do the workers in A and B C．are not affected so adversely by the levying of duties as are workers in A and B D．receive wages equal to those workers in A and B

We could start with the advantages of mobile phones. There are many things that we could do with mobile phones. With the advancement of technology，more and more features are being added to the mobile phones which make them more useful. In addition to making calls，mobile phones also support a wide variety of other services such as text messaging，email，Internet access，business applications，gaming and photography. We can bring them everywhere，and can be reached by others anytime. They make the world smaller，bringing people together no matter where they are. But we could have some risks when using our mobile phones. We may have accidents when we use them while driving. Some studies show that mobile phones can do harm to our bodies;and materials in mobile phones could damage our environment. Since there are so many risks，why do we still have mobile phones？This is because these risks or disadvantages can be overcome. For example，while we are driving we can easily pull up our car if we really need to use the phone. Mobile phone manufacturers are reducing the radiation of mobile phones to avoid health risks. Though there are both pros and cons of using mobile phones，we could easily see that there are more advantages than disadvantages. Moreover，mobile phones are becoming cheaper，which might be another reason why mobile phones are increasingly used today. 1. Which of the following functions is NOT mentioned in the passage？ A. Text messaging. B. Camera. C. GPS. 2. What risks might mobile phones cause？ A. Traffic accidents and health problems. B. Environmental damage. C. Both A and B. 3. What are mobile phone manufacturers doing to prevent mobile phone users from health risks？ A. They are reducing the radiation of mobile phones. B. They are trying to persuade people to use mobile phones less. C. They are developing new models of mobile phones. 4. Why do people still use mobile phones despite their disadvantages？ A. Because people don’t believe that mobile phones have any disadvantages. B. Because the disadvantages of mobile phones can be avoided. C. Because people cannot live without mobile phones. 5. According to the last paragraph，why are mobile phones increasingly being used today？ A. They are safer. B. They have more functions. C. They are becoming cheaper.