Had they known what was coming next, they second thoughts.
A. may have B. could have
C. must have had D. might have had
假如你是你校英语内刊的编辑李华，你校的一位同学Mary最近在网上结识的一位网友约她见面，她不知道该不该去，因此写信向你咨询。请你用英文给她写一封建议信。内容应包括：
1. 最好不要去见任何网友；
2. 如果确实想见，要保证自身安全（选择人多的公众场合；不要透露过多的个人信息）。
注意：1. 词数100左右；
2. 文中不得使用真实姓名和学校名称；
3. 开头和结尾已给，不计入总词数。
Dear Mary,
I’m happy that you have made friends with someone online.________________________________________
____________________________________________________________________________________________
____________________________________________________________________________________________
____________________________________________________________________________________________
____________________________________________________________________________________________
Yours,
Li Hua
Last Saturday, mom and I went to buy a down jacket for my grandpa. When we got to a big store, we saw down jackets of vary colours and styles. There were so many of them that it spent us quite a while to decide which one to buy. Finally, under the help of the shop assistant, he selected a black thick jacket for grandpa. Immediately, we returned back home to show it to my grandpa. Seeing it, he was very happy and couldn’t wait to put on. But we were annoying to find something was wrong with the zipper. Hurriedly, I took it back to the store and explained the shop assistant the problem To my satisfaction, she is very kind and helped me choose another one patiently. Stand in front of the mirror, my grandpa looked at himself in the new coat, smiling contently. How delighted I was!
根据短文内容，从选项中选出能填人空白处的最佳选项。选项中有两项为多余选项。
Amazon Introduces a Digital Music Locker
Amazon.com, plans to introduce a service that will let people upload their digital music to the Web from anywhere. 1.
The service, known as a music locker, was made available to Amazon account holders early Tuesday．Amazon will offer a Web-based hard drive backup service called Cloud Drive, where people can store documents, photos, videos and music．
It will also offer Cloud Player, which will let people listen to, download and make play lists from the music they store on Cloud Drive from any Web site or from an app on Android devices． Cloud Player will automatically upload songs bought on Amazon． 2.
3. One key difference is that Google and Apple reportedly want to automatically make all the music that a user owns available to stream on other instruments, while Amazon will require that people upload music, except songs they buy on Amazon, to access it elsewhere．
The dream of these companies, along with many start-ups, is for people to be able to listen to their music from any computer or phone． 4. Several experts in digital music say that the music locker business is still legally ambiguous． 5.
Amazon says it has avoided the problem, because its users would upload their songs, in MP3 to the cloud-based service, just like backing them up on an external （outside） hard drive or a Web-based computer backup service．
Companies, including Google and Spotify have been forced to delay introducing certain services while they negotiate with the music labels and publishers．
A．People can access it from any computer and from Android phones．
B．But they have all run into the same problem: music companies and publishers would prefer that listeners buy a new copy of a song everywhere they want to listen to it．
C．Experts suspect that Amazon seems to be copying what Google and Apple have already achieved．
D．They agreed to speak on the condition of anonymity （匿名） because their agreements with Amazon are confidential．
E．It is impossible for Web companies to tell whether a song was bought legally or downloaded illegally．
F．Amazon is racing Google and Apple, both of which are interested in offering similar services．
G．It will also scan iTunes or Windows libraries to find other music to upload．
Batteries can power anything from small sensors to large systems．While scientists are finding ways to make them smaller but even more powerful, problems can arise when these batteries are much larger and heavier than the devices themselves．University of Missouri（MU） researchers are developing a nuclear energy source that is smaller, lighter and more efficient．
“To provide enough power, we need certain methods with high energy density（密度）”，said Jae Kwon, assistant professor of electrical and computer engineering at MU．“The radioisotope（放射性同位素） battery can provide power density that is much higher than chemical batteries．”
Kwon and his research team have been working on building a small nuclear battery, presently the size and thickness of a penny, intended to power various micro / nanoelectromechanical systems （M/NEMS）．Although nuclear batteries can cause concerns, Kwon said they are safe．
“People hear the word ‘nuclear’ and think of something very dangerous,” he said, “However, nuclear power sources have already been safely powering a variety of devices, such as pace-makers, space satellites and underwater systems．”
His new idea is not only in the battery’s size, but also in its semiconductor（半导体）．Kwon’s battery uses a liquid semiconductor rather than a solid semiconductor．
“The key part of using a radioactive battery is that when you harvest the energy, part of the radiation energy can damage the lattice structure（晶体结构） of the solid semiconductor,” Kwon said, “By using a liquid semiconductor, we believe we can minimize that problem．”
Together with J．David Robertson, chemistry professor and associate director of the MU Research Reactor, Kwon is working to build and test the battery．In the future, they hope to increase the battery’s power, shrink its size and try with various other materials．Kwon said that battery could be thinner than the thickness of human hair
1.The text is most probably a ________．
A．science news report B．book review
C．newspaper ad D．science fiction
2.Liquid semiconductor is used to _________．
A．get rid of the radioactive waste
B．test the power of nuclear batteries
C．decrease the size of nuclear batteries
D．reduce the damage to lattice structure
3.According to Jae Kwon, his nuclear battery _______．
A．uses a solid semiconductor B．will soon replace the present ones
C．could be extremely thin D．has passed the final test
4.Jae Kwon gave examples in Paragraph 4_________．
A．to show chemical batteries are widely applied
B．to introduce nuclear batteries can be safely used
C．to describe a nuclear-powered system
D．to introduce various energy sources
One school night this month I walked quietly up to Alexander, my 15-year-old son, and touched his cheek gently in a manner I hoped would seem casual．A year ago he would have ignored this disturbance but now he reacted impatiently and leaned back to his computer screen．
I made a mistake: breaking into my teenager's personal space. “The average teenager has pretty strong feelings about his privacy," Lara Fox and her friend Hilary Frankel told me. Mr．Frankel and Mr．Fox, both 17, are the authors of Breaking the Code, a new book that seeks to bridge the generational divide between parents and adolescents．It is being promoted by its publisher as the first self-help guide by teenagers for their parents, a kind of "Kids Are From Mars, Parents Are From Venus" that explains the language and actions of teenagers．The girls dealt with issues including hanging out late, money, school pressures, smoking etc．
Personally, I welcome their opinions．The most common missteps in interacting with teenagers arise from the war between parents exercising their rights to know what goes on under their roof and teenagers firmly guarding their privacy．Teenagers can be quick to interpret their parents' remarks and respond with anger that masks their vulnerability （脆弱 ）. Ms Fox said, "What we want above all is your approval．Don't forget, no matter how much we act as if we don't care what you say, we believe the things you say about us．"
Nancy, a New York child-raising expert said she didn't agree with everything the authors suggested but found their arguments reasonable．"When your kids are saying, ' You don't get it, and you never will, ' there are lots of ways to respond so that they will listen and that is what the writers point out．"
" My parents helped me see that, " Mr．Fox told me, " even though they used to stay out late and ride their bicycles to school, times have changed and the way parents educate children is different．These days there is a major fear factor in bringing up kids．Parents worry about their child crossing the street．" The writers said they hoped simply to throw light on teenage thinking．
1.According to the two girls, teenagers nowadays are ____．
A．independent B．intelligent
C. inconsiderate D．sensitive
2.The underlined sentence "You don't get it, and you never will" in the 4th paragraph implies that ____．
A．the teenagers don't want/to admit their weakness
B．the teenagers think that their parents will never understand them
C．the parents do not necessarily force into the world of their children
D．the generation gap cannot be shortened despite their parents' efforts
3.It can be inferred from the last two paragraphs that ____．
A．teenagers should guard their privacy
B．Nancy totally agrees with the two girls' opinions
C．parents are more concerned about children's safety
D．the two girls have obtained numerous support from the public
4.Why does the author mention the book "Kids Are From Mars, Parents Are From Venus ?
A．It is one of the best-sellers
B．It is also written by the two girls
C．The two books have the similar theme
D．The two books have different opinions
