问题 解答题

是某同学设计了“氧气是绿色植物在光下制造的”实验装置,

①试管中有气泡产生的是______,产生的是否是氧气?请进一步证明:______.

②甲、乙构成一组对照实验,变量是______,得出的结论是______;甲、丙构成一组对照实验,变量是______,得出的结论是______.

答案

答:为验证绿色植物在光下产生氧气,该同学设计了两组对照实验:甲与乙、甲与丙,变量分别是光和绿色植物.

①在甲、乙形成的对照实验中,甲组实验中的绿色植物由于有光的照射,故能进行光合作用而产生气体,为了验证该气体是否为氧气,可用将要熄灭的木条检验.

②该同学设计的两组对照实验:甲与乙、甲与丙,变量分别是光和绿色植物,由此得出的结论分别为:光照是产生氧的条件;氧是绿色植物产生的.

故答案为:①甲;把将要熄灭的木条伸入试管口,看是否复燃

②光照;光照是产生的条件;绿色植物;氧是绿色植物产生的

选择题
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