已知△ABC中，角A，B，C的对边分别为a，b，c，a=2，c=3，∠B=60°

从运动场的一端到另一端全长96米，从一端起到另一端每隔4米插一面小红旗。现在要改成每隔6米插一面小红旗，问可以不拔出来的小红旗有多少面( )

A．12

B．11

C．10

D．9

阅读理解。

     The nervous-looking young man had waited for a few moments outside the jeweler's before he got enough

courage to enter. He was warmly greeted by a young assistant. James felt a rush of blood to his face as he

explained he would be bringing in his future wife to choose a birthday present. The assistant listened carefully

and told him he'd better buy a necklace (项链). He wasn't used to buying jewelry and was a little worried about

overspending, because he was not very rich. After some discussion as to a reasonable price and the type, the

assistant showed him dozens of necklaces and helped him to choose. At last James chose one and left the shop

promising to return at five o'clock. Half an hour later than planned, James did return to the shop with his future

wife, Laura. The assistant acted as if she had never seen him before. When she was asked to show them some

necklaces, she first brought out some inexpensive ones for them to choose, and then gave them the ones she

had prepared. A choice was soon made and they went away satisfactorily. Later James would certainly come

back to buy what he wanted when he got married.

1. The good title for this passage is " _____". [ ]

A. A Clever Assistant.

B. Buying a Birthday Present

C. How to Choose a Necklace

D. A Brave Young Man

2. The word "overspending" in the passage means _____. [ ]

A. spending too much energy

B. spending too much time

C. spending more time than he planned

D. spending too much money

3. When James told the assistant why he wanted to buy a present, his face _____. [ ]

A. turned pale

B. turned red

C. turned yellow

D. turned black

4. James and Laura reached the shop at _____. [ ]

A. 4:30

B. 5:00

C. 5:30

D. 6:00

Gmail tmned five years old this week．It's somewhat amazing to think we've only had it since 2004; Gmail changed the webmail game forever by offering features we now take for granted: a streamlined interface （界面]） , powerful search, pioneering use ofAjax and a then-huge 1 GB of mailbox space．“You'll never need to delete another message " was how Google described it at the time．

Back then, I was still making do with Hotmail．But its clumsy interface and tiny amount of storage space made the decision to move on an easy one．Getting an account made all the difference in the world to my email experience．Suddenly I was freed from having to delete emails every few days to make space in my mailbox．And the app（application） was smooth and responsive, like a desktop client （客户端程序）—and pretty fast in comparison to Hotmail．" Conversation view" and using labels instead of folders took a little getting used to, but in all Gmail felt far more professional and made me much more productive．

Gmail is a favorite app of ours ever on WebWorkerDaily, and with good reason．It's still the best webmail client for web workers as it lets us access our email whenever and wherever we need to, on any device, with minimum effort．And Google hasn't spent the five years sitting on its Gmail success, either, but has introduced improvements to the service that include Gmail Tasks, chat, video chat and voice chat, combined with Google Calendar and Docs, Google Apps for Domains, and, of course, even more storage．We've recently covered the many features found in Gmail Labs: a way to "undo" seat messages, using canned responses for smart autoresponders, offline support using Gears and how to customize the way you．view your mailbox using multiple inboxes．

小题1:The underlined sentence in the first paragraph implies that_____．

A．we shouldn't take Gmail for granted

B．you can try to write any kind of message

C．Gmail can correct your mistakes of itself

D．you needn't worry about the mailbox space小题2:Which of the following is not Gmail's striking feature?

A．Offline support．

B．Using labels．

C．Undo sent messages．

D．Mailbox space．小题3:Gmail is _____．

A．first introduced by WebWorkerDaily

B．a tool merely used to send messages

C．a great success just the same as Hotmail

D．a webmail client with multiple functions小题4:What can we infer from the passage?

A．It is easier and more convenient to use folders．

B．Quantities of people have chosen to use Gmail．

C．Gmail had a video chat function when invented．

D．Gmail and Hotmail were invented at the same time．小题5:What is the best title of this passage?

A．Gmail— favourite app of ours

B．Functions of a special email service

C．Comparison between Gmail and Hotmail

D．Advantages and disadvantages of Gmails

检流计线圈中,装铁芯的目的是增加重量,使之稳定。

Which of the following statements about the characteristics of a monopoly and those of an oligopoly is least accurate（）

A. In an oligopoly, there are often substantial economies of scale.

B. In both a monopoly and an oligopoly, there are high entry barriers into the market.

C. In an oligopoly, the decisions of each seller are independent of the policies followed by competitors.