问题 选择题

下面说法不正确的是[ ]

A.三角形的面积一定,底和高成反比例

B.长方形的周长一定,长和宽不成比例

C.订阅《少年报》的份数和总钱数成正比例 

D.因为圆周长C= πd,所以π与d成反比例

答案

答案:D

解:A、三角形的底×高=面积(一定),是乘积一定,成反比例,此句正确;

B、长方形的长+宽=周长(一定),是和一定,不是乘积或比值一定,不成比例,此句正确;C、订《少年报》的总价÷份数=单价(一定),是比值一定,成正比例,此句正确;D、圆周长C=πd,但π是定量,不随着d的变化而变化,所有π与d不成比例,原句错误;故选:D.

阅读理解

In the computer age, most of us take a broadband(宽带)Internet connection for granted. Whether cable or mobile broadband, today’s connections are many times faster than those in the early days. Videos play smoothly, complex websites load quickly, and files download much faster than ten years ago. And the files are much bigger too.

There’s a catch, of course: You have to live near enough to a major city to get broadband Internet. If you don’t, it’s slow dial-up access for you. And for those living really far out, there may be no Internet access at all.

Technology experts often talk about the “last mile” problem, which refers to the difficulty of bringing Internet access to remote locations. In cities and suburbs, it’s relatively easy to provide access for everyone. It is much more difficult to deliver access to those living far from cities, especially in developing countries. Internet service providers, for their part, have been reluctant to provide access to sparsely (稀疏地) populated areas. The handful of Internet users they would reach wouldn’t cover the expense.

But every year, technological advancements allow of more and more Internet users. Most broadband connections today run over existing cable TV and telephone lines although these technologies aren’t available everywhere.

Some companies have delivered the Internet over standard power lines. Advancements in cheaper, more efficient fiber optics cables (光纤电缆) promise to bring extremely fast Internet connections to more users.

Still, the “last mile” problem remains hard to deal with. There will always be somewhere that doesn’t have an affordable broadband connection. But someday that might not matter. If the rapid progress in cell phone technology is any indication (迹象), it may not be too long before an Internet connection simply follows you wherever you go.

小题1:The underlined part “a catch” (in Paragraph 2) probably means “_____”.

A.a rare challenge

B.a desirable plan

C.an efficient device

D.a hidden problem小题2:What can we know from the third paragraph?

A.Internet connection has not been popular in most cities.

B.Internet service providers care about rural(农村的)customers.

C.Computer is popular in developing countries.

D.It is hard to bring Internet access to users in remote areas.小题3:Paragraph 4 mainly tells us that technological advancements _____.

A.make TV and telephone available everywhere

B.bring great change to people’s everyday life

C.make it possible for more people to use the Internet

D.bring faster Internet connections to users小题4:What may eventually settle the “last mile” problem?

A.The broadband connection’s getting faster.

B.More and more Internet users.

C.more and more Internet connections.

D.The rapid progress in cell phone technology.

单项选择题