问题 选择题

近期煤价节节攀升,少数不法商贩将煤矸石破碎后掺在优质煤中高价销售,客户使用这种煤之后会导致经营成本增加.为防止上当,最恰当的方法是检测煤的(   )

A.比热容

B.质量

C.温度

D.热值

答案

答案:D

题目分析:比热容是物质的一种特性,反映了相同质量的不同物质升高相同的温度吸收的热量不同;质量是物体所含物质的多少;温度是指物体的冷热程度;热值是燃料的一种特性,是指1kg某种燃料完全燃烧放出的热量,热值越大的燃料在完全燃烧相同质量的燃料时放出的热量越多,掺假后煤的热值降低,所以可以用热值来区分,而从比热容、质量、温度无法区分.故选D.

阅读理解

Did you know that a new weblog is being created each second? Many of these bloggers are teenagers. While their parents wrote in a diary to express their emotions, or shared their interests by spending time with friends, teens are now using blogs instead. In fact, in the US, one in every five school-aged teens has a blog. Most of these are just chatter, some are funny or clever, but a few have become Internet success.

For example, Chloe Spencer’s blog ‘Neopets Fanatic’ gets around 300,000 hits per month. When Chloe was 15, she started the blog out of her strong liking for Neopets, a kind of pet website. One reason her blog has so many visitors is because she gives instructions and tips for the popular pet site.

Then there is Tavi Gevinson’s blog ‘Style Rookie’. It is said to get 1.5 million hits per month. Tavi, who started her blog when she was just 12, puts up her photos of her own clothes online as well as designers’ collections. Tavi’s blog has caught on because she knows a lot about style for someone so young, and she is not afraid to try out unusual clothes or see things in a different way.

Blogs like these are interesting, but they only become really popular after better-known websites link to them or they get noticed by the media(传媒). For example, Tavi’s blog became an overnight(一夜之间) success after being written about in The New York Times. Popular blogs can even earn money, usually from advertisements that companies pay to put up on the bloggers’ sites.

So for some, blogging is just a recreation(消遣), but for others, it can become a source of income and even a full-time job!

小题1: Teens nowadays ________ than their parents did.

A.have more ways of communication

B.share their feelings more

C.write in diaries more often

D.make more friends小题2: In line 4, the underlined word ‘chatter’ means talk about ________ topics.

A.funny

B.clever

C.serious

D.unimportant小题3:Chloe Spencer and Tavi Gevinson are both ________.

A.pet lovers

B.teenage bloggers

C.interested in fashion

D.keen on taking photos小题4: From the passage we know that Chloe Spencer is a person who ________.

A.visits many websites

B.loves pets

C.is easy to get angry

D.rarely gives opinions小题5: According to paragraph 4, Tavi Gevinson’s blog ________.

A.is not well-known yet

B.is written every night

C.became popular very quickly

D.got a lot of money from advertising小题6:The best title for the passage might be ________.

A.How to be good teen bloggers

B.How teen bloggers attract the media

C.Keeping diaries or writing blogs

D.Teen bloggers mean business

名词解释