A城到B城的公路长160千米.一辆汽车走高速路的速度是80千米/时,走普通公路的

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问题:

A城到B城的公路长160千米.一辆汽车走高速路的速度是80千米/时,走普通公路的速度是40千米/时.从A城去B城走高速路比普通公路节省多少时间?

考点:整数,小数,分数,百分数和比例的复合应用题
题型:解答题

达尔文发现远离大陆的克格伦岛上经常刮暴风,岛上树木花草大多都很低矮,许多昆虫翅退化、很弱、不能飞,少数昆虫能飞,但翅都异常发达.请回答:

(1)昆虫的不同形态最初是由于______产生的.

(2)暴风对昆虫两种翅的形成所起的作用叫______.

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与操作技能相比,心智技能的对象具有观念性,执行具有内潜性,结构具有__________

题型:解答题

某同学和家长去湖南省旅游,下列景点中参观不到的是(  )

A.黄鹤楼

B.武陵源

C.衡山

D.岳阳楼

题型:解答题

Many businesses today use conferences as a means of discussing new plans of the company. As people are paying more attention to the environment and green problems, more businesses are looking for ways to reduce their negative effect on the environment. Many businesses do this by using Web conferencing.

Web conferencing is a technology that allows people to communicate more effectively over the Internet. It’s an easy way of hosting and attending conferences without having to leave the office. Each of the people involved in a Web conference will be posted an invitation to the conference with the time and date of the Web conference on it. When the conference is ready to begin, all participants (参与者) must sit at their computers and they will be connected over the Internet.

With Web conferencing all participants attend conference from the comfort of their own desks. Obviously, in doing this no fuel is used in traveling to and from a conference, and less work is taken up in attending a conference.

Any material to be used during Web conference is simply e-mailed to all the participants before the conference. Participants can then either choose to print material or read it on screen. This not only saves paper but also greatly reduces mailing costs for the business.

As a conference hall or business center isn’t being used, it means that the only power that is used is the power that is used by the participants’ personal computers. Similarly, conference organizers don’t have to arrange for food or overnight accommodation. All this means that less energy is used.

Often in business some companies actively choose to do business with other companies that do many things to reduce their negative impact on the environment. And Web conferencing helps you show other businesses that you are willing to work hard for the green cause.

小题1:What is the passage mainly about?

A.Ways of protecting the environment

B.Green benefits of Web conferencing

C.Ways of hosting a Web conference

D.Impact of Web conferencing on costs小题2:According to paragraph 1, many companies use Web conferencing because they ______.

A.are interested in using any new technology.

B.believe that Web conferencing is more convenient.

C.want to do something to protect the environment .

D.haven’t enough money to hold a traditional conference.小题3:The participants of a Web conference _____.

A.will be e-mailed an invitation before the conference.

B.are required to sit in an office together.

C.will receive many paper materials.

D.must have access to the Internet.小题4:Which of the following words best describes the author’s opinion about a Web conference?

A.Useless

B.Environmentally friendly

C.Inconvenient

D.Money-consuming

题型:解答题

( )是城市形成和导致城市兴衰的重要因素之一。

A.区域经济条件

B.交通运输条件

C.用水条件

D.供电条件

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