问题 实验题

小明同学做了“做观察水沸腾”的实验。

(1)实验中为了减少实验时间,可采取什么措施:______________________;(只写一种)

(2)当水温接近90℃时,每隔1min记录一次温度, 表格如下:

此时水的沸点是____,水沸腾过程中特点是_______________。

答案

适当提高水的初温、适当减少水的质量等只要合理均可 ,98 , 吸热,温度不变

题目分析:为了缩短水加热的时间,可考虑从减少水量和提高初温等方面着手.知道沸点的概念:液体沸腾时的温度.知道水在沸腾过程中,吸热但温度保持不变.

(1)为了减少从开始加热到沸腾的时间,可以采取提高水的初温、减少水的质量、加盖子等措施.

(2)从表格中可以看出,水在沸腾时温度保持98℃不变,所以水沸腾的温度是98℃.因此水沸腾过程中特点是:不断吸热,但温度保持不变.

单项选择题 A3/A4型题
阅读理解

WASHINGTON—US President Barack Obama said Thursday that he had known about NBA star Jeremy Lin’s talent long before the“Linsanity”phenomenon swept the sport.

“I knew about Jeremy before you did because Arne Duncan, my secretary of education, was captain of the Harvard team,”Obama told the famous US sportswriter Bill Simmons in an interview.

“When Arne and I were playing, he said,‘I’m telling you, we’ve got this terrific guard named Jeremy Lin at Harvard.’And then when one of my best friends, whose son is a freshman at Harvard, went for a recruiting(招募) trip he saw Lin in action, so I’ve been on the Jeremy Lin bandwagon(时尚) for a while,”said the president, who is a Harvard Law graduate.

Lin, the New York Knicks’ point guard, though he was cut twice in December 2011, had had a sudden rise in the past month to high points scoring stardom in Madison Square Garden, the world’s biggest basketball stage.

He is the first Chinese-American player in the NBA. He has already developed a devoted following among many Asian-Americans and in China, Taiwan, the Philippines and other countries.

Clicks to the NYKnicks. Com website surged as basketball fans from around the world search for Lin’s news and highlights.

“He seems like a wonderful young man. It elevates(提升) this great sport all round the world,”said Obama, a Chicago Bulls fan.“And what’s been encouraging is to see how fast the sport has bounced back(恢复) recently.”But he sounded a note of caution on how much basketball costs to watch.

“It’s really important for professional athletes and sports owners to just remember you got a whole bunch of folks out here, all across the country, who invest so much in their teams. All they ask is not to be so selfish that you’re not looking out for your fans,”Obama said.

小题1:President Obama learned about Jeremy long before through      .

A.news reports

B.a friend

C.Bill Simmons

D.Arne Duncan小题2:The underlined word“surged”in Paragraph 6 probably means     .

A.moved suddenly and quickly

B.stopped gradually

C.moved slowly

D.suddenly broke down小题3:President Obama finds it encouraging that      .

A.Chicago Bulls is playing wonderfully

B.Jeremy Lin is becoming more popular

C.NBA matches have returned to normal

D.audience is concerned about basketball小题4:Both athletes and sports owners should care about folks because      .

A.they have made contributions to charities

B.all teams are in need of support from fans

C.they pay to watch their favorite teams play

D.they can decide the result of a game