问题 问答题

硫酸铜溶液可以使锌与稀硫酸的反应变快.在a、b两份稀硫酸(足量)中各加入等质量的锌粒,其中一份还滴入少量的硫酸铜溶液,反应过程生成的H2质量(m)与时间(t)的关系如右图,试回答:

(1)由于加入硫酸铜溶液而使反应变快的是______ (填a或b).

(2)充分反应后得到的H2质量较大的是______ (填a或b),这是因为______.

答案

(1)a和b图象中反应完全时a用的时间较短,也就是速度较快.

(2)反应完全后b的图象在a的上方,生成的氢气量多,这是因为a是在加入硫酸铜时锌与硫酸铜反应了一部分,导致生成的氢气量变小了,

故答案为:a;b;b中没有硫酸铜加入,锌粒全部与稀硫酸发生了反应(或答a中因加入了硫酸铜,锌粒没有全部与稀硫酸发生反应).

阅读理解

Like a scene out of a reality show or a Disney movie, Southgate, Mich., teenager Ashley Qualls' moment has arrived.

She may not have an MBA, a high-school diploma, or even a driver’s license yet, but Asheley Qualls already has an influential website (www. Whateverlife.Com). The 17-year-old girl hass been building her online business for two years.

In December 2004, Qualls borrowed $8 from her mother to buy the Whateverlife.com. domain name (域名). She intended to use the website as a way to share her design for My Space pages woth her friends.

But in the incontrollable, fast-moving world of cyberspace, others began noticing Qualls’ site even though she never has spent a penny on advertising.

When it comes to web traffic, Whateverlife.com .currently ranks No. 825 out of 20.3 million websites, drawing 2.4 million visitors worldwide during the last 30 days. Qualls said that on average, 72% of her site's audience made a return visit.

Whateverlife.com earned a million dollars in revenue last year and is on track to do the same this year.

"I'm stubborn and I'm independent," she said from her office in the basement of her house. "I like the feeling that it's my company, and I want to have the say-so (主张)in everything."

But don’t mistake Qualls for another smart but spoiled teenager. She is growing up fast but owns talent for life and business that elude many girls of her age.

The task of running a million-dollar company isn’t without its sacrifices( 牺牲) and challenges for a teenager. Qualls dropped out of Lincoln Park High School after her sophomore year to work fulltime on Whateverlife.com, a decision that she said shocked her family, friends and teachers . She now is studying to get her degree in graphic design.

小题1:Many people noticed Qualls’ site because_____________________.

A.it was set up by a 17-year-old girl

B.Qualls shares her design with her friends

C.Qualls has been building her online business

D.the world cyberspace develops fast and uncontrollable小题2: Which of the following statements is NOT true according to the text?

A.Qualls’ Website Whateverlife .com. No. 825 in 20.3 million websites.

B.About 2.4 million visitors worldwide visit her website every month.

C.Most of her audience have visited her website at least twice.

D.Qualls has the right to decide everything in her company.小题3:The underlined word “elude” in the 8th paragraph means_______________.

A.avoid

B.embarrass

C.exceed

D.encourage

多项选择题