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I have been using the Internet since I was five years old, when my dad first sat me down in front of a computer and connected me the World Wide Web. I’ve always felt like a master of the Internet world. AOL Instant Messaging, MSN, Gmail, Facebook. Myspace---I’ve got it all under control. I thought there was nothing more to it besides checking my e-mail and wasting my time, until I was introduced to electronic commerce(e-commerce): business on the Internet. Some online business are run from one- room home offices. Others have hundreds of employee(雇员)spread across five different continent. Have you ever heard of Amazon. com, Yahoo. com? My friends often said they got cheap textbooks off Amazon.com, or had a good deal(交易)on Steve Madden boots that were on sale at SteveMaden.com. Unfortunately for me, I continued my “e-commerceless” Web-surfing, unaware(不知道)of all the deals I was missing out on. That is, of course, until my sister finally sold the idea to me. “Why are all these packages arriving in the mail for you, Katy?” I asked her one day. Strange envelopes had been put on our doorstep for weeks now, each one always addressed to my sister; and we all know little sisters should never be getting more mail than their elders! “Oh, it’s the things I ordered online!” she answered. I watched speechlessly as she opened them. There was no way our parents were letting her spend that much money- online or off! “How much did all of this coat?” “Oh, only about $15in all!” She said excitedly. “Everything on eBay is on sale! It’s way better than going to the mall.” I felt as if my entire life, there had been a store right in my backyard that I had never walked into! That week, I ordered a used Spanish textbook for my summer course online for 10 percent of the publishing price. A few days later, I bought an iPod protector and a book or two via the wonderful eBay.com. 小题1:From the first two paragraph we can conclude that the author A.had no experience using computers B.had no idea of what e-commerce is C.only used the Internet to check e-mail D.thought surfing the Internet was a waste of time 小题2:The writer didn’t find out about e-commerce until A.he stopped web-surfing B.he visited a store in his backyard C.his friends told him about the online deals they made D.his sister explained the packages she got by mail 小题3:We can infer from the last paragraph that the author . A.has begun to enjoy online shopping B.loves the big store in her backyard C.feels she is a true master of the Internet D.never enjoyed shopping that much 小题4:What’s the purpose of the article? A.To make an online shopping ad. B.To do business on the Internet. C.To advise people to do online shopping D.To suggest how he begins online shopping. 小题5:What would be the best title of the article? A.Online Business B.Good deals C.A master of the Internet D.Everything on Sale
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【简答题】原子间通过 而形成的化学键,叫做共价键。共价键的本质是 ,其形成条件是两个具有 的原子轨道,尽可能达到 。
【简答题】形成共价键的本质是____,共价键形成的两个基本要点是____和____。
【单选题】在我国,个人贷款业务以 为主体
A.
个人住房贷款
B.
个人汽车贷款
C.
个人教育贷款
D.
个人经营类贷款
【简答题】共价键的本质是 。
【单选题】共价键的本质是
A.
方向性和饱和性
B.
方向性
C.
饱和性
D.
无方向性和饱和性
【简答题】我国个人贷款业务以( )为主体。
【判断题】共价键的本质是电性作用力,但又不同于正负离子间的静电引力。
A.
正确
B.
错误
【单选题】我国个人贷款业务以( )为主体。
A.
个人住房贷款
B.
个人教育贷款
C.
个人汽车贷款
D.
个人经营类贷款
【简答题】共价键的本质是什么?可用哪些物理量来描述?
【单选题】共价键的本质是
A.
不同自旋方向的电子配对成键
B.
原子轨道重叠,核间电子概率密度大吸引原子核而成健。
C.
饱和性
D.
方向性