2.　　　　 course n.过程；进程；课程；一道菜

[典例]

a course of medical treatments. 医学治疗的一个疗程

a short -term course短期班

a dinner of five courses有五菜的正餐

[练习] 汉译英

---在上课期间必须关闭手机吗？

---当然。

__________________________________________________________________________________________

Keys:---shall we shut the mobile phone in the course of lecture?

---of course.

1.　　　　 concentrate vt.集中；聚集

[典例]

1)Authority was concentrated in the president. 政权集于总统一身　

2)We concentrated on the task before us. 我们专注于眼前的任务

[重要用法]

concentration n. 集中， 专心

with deep concentration专心

concentrate one's attention on [upon] 把注意力集中在

[练习]汉译英　

1) 如果你全神贯注，就能解决这个问题。

__________________________________________________________________________________________

2) 面对巨大的灾难，整个社会致力于解救废墟中的人们。

__________________________________________________________________________________________

Key: 1)You’ll solve the problem if you concentrate upon it. 2) Facing the great disaster, the whole society concentrated its attention on rescuing the people in ruin.

III 词性变化 (旨在提供语法填空所需材料)

IV 重点词汇 (旨在提供综合运用所需材料)

I单元要点预览(旨在让同学整体了解本单元要点)

II 词语辨析　 (旨在提供完形填空所需材料)

30．The fifth paragraph mainly tells us______．

A．how the system works

B．how the electricity be converted into heat

C．the function of the ambitious technology

29．Which of the following statements is TRUE?

A．The laser does harm to people's health．

B．The gadgets like audio speakers have been shown at the International Consumer Electronics Show this week．

C．The word 'recharge' has been deleted from the English dictionary．

D．The technology Can also save energy because it would not work when unnecessary．

28．According to James Holland，we know that______．

A．a cell phone Can be powered only on a desk

B．gadgets can be charged in a loom with wireless power

C．a right charger is needed

D．each room should have wireless power

27．The undedined word "delve"　 in Paragraph 3 refers to______ ．

A．hunt for　　 B．look into　　 C．think of D．put away

26．What does the writer want to tell us in the passage?

A．A wireless instrument used for charging．

B．The only company to show the ambitious technology．

C．A means of broadcasting electricity to gadgets．

D．A new efficient energy．

25．The average citizen dislikes the motorcyclists because______

A．all motorcycles are wild young men

B．all motorcycles are irresponsible young men

C．all motorcycles are lawless young men

D．they frequently look dirty，they often make an unpleasant noise，and their appearance contributes to people's terrible imagination

B

No more batteries，no more chargers and no more wires．This is the future promised by　 "wireless power"．a means of broadcasting electricity through the air to laptops，iPods and other gadgets(小器具)without the need for cables and sockets(插座)．

Wireless lighting，audio speakers and digital picture frames are expected to be among the first commercial products exhibited in Las Vegas this week at the International Consumer Electronics Show，the world's biggest gadgets tradeshow．

Experts believe this is just the beginning and that eventually wireless electricity could do for battery life what WiFi(局域网)did for，the Internet．In a world without wires，laptop users in cafes and airport terminals(终点站)would be inside an "electricity hotspot" and no longer have to delve an awkwardly located socket．

"You'd be able to buy．a desk that charged any gadget placed on it,or power any PC you put on top，" said James Holland，editor of gadgets website Eleetricpig．co．uk．"If each room had wireless power，you'd know that once you walked through the front door your nmbile would start charging up-even while still in your bag or pocket．You'd never need to hunt for the right charger again．"

Among the companies showcasing the ambitions technology at CES is PowerBeam．Its system turns electricity into an invisible laser,then beams(传播) it as heat，across the room to a solar cell that conveys it back into dectricity．

David Graham，the co-founder of PowerBeam，said："We're going to delete the word　 'recharge' from the English dictionary．If your，cell phone is recharging on your desk．all day，you won't be thinking about．it．" The Silicon Valley company can currently use a laser to generate about 1．5 watts of power to_a solar．cell 10 meters away．This,sould be enough to power an electronic speaker or small LED(二极管) lights，but not enough to operate a laptop，which requires about 30 to 50 watts．However，Graham said that the technology could comfortably be scaled up(提高)．

PowerBeam insists its laser does not lead to a risk to users' health because it is simply moving heat from one place to another．Graham said that，if someone walked through the beam，itwould shut down within a thousandth of a second，then restart once the path is clear．The technology also promises because it would only power products when needed．