问题 填空题

用一支大的注射器吸取一些乙醚后,用橡皮帽堵住注射器的小孔(如图所示)。向外拉动活塞到一定程度时,注射器里的液体乙醚消失,这是_________(填物态变化的名称)现象,需要_________(选填“吸”或“放” )热。然后推压活塞,会看见注射器中又出现了液态乙醚.这表明用  ____     的方法可以使气体液化.

答案

汽化 吸 压缩气体

题目分析:向外拉动活塞注射器内部气压降低,到一定程度时乙醚汽化,液体汽化需要吸热;然后推压活塞,注射器内部气压升高,乙醚气体放热液化。表明可通过“压缩气体”,增大气压的方法使气体液化。

单项选择题 A1型题
阅读理解

Down on the beach of Dover, 56-year-old Channel swimmer Jackie Cobell bravely set off for Calais. The time was 6:40 am. 28 hours and 44 minutes later the exhausted, successful mother from Kent crawled (爬行) to the shore and walked proudly into the record books. After five years in training, Mrs Cobell became the slowest person to cross the Channel under her own steam. The previous record for the slowest crossing, set by Henry Sullivan at 26 hours and 50 minutes, has stood for 87 years before Mrs Cobell started at Dover Saturday morning.

She had struggled through changing tides that swept her first one way, then the other. It turned the 21-mile crossing into a 65-mile one. She declared, “Time and tide wait for no man—and they certainly didn’t wait for me. I was fully expecting it to get dark before I got to Calais but I never imagined I’d also see the dawn again. But I wasn’t going to give up.”

Her feat(壮举) raised more than $2,000 in charity sponsorship for research into Huntingdon’s disease, a sum that was continuing to grow as news of her achievement spread. That was why she did it. “I don’t really know myself,” she said. “ I just kept thinking of all the people I’d be letting down if I stopped.”

Mrs Cobell took to the water so well at school. But after bringing up two daughters, she started to gain weight. Five years ago she took up swimming again and decided to prepare for the Channel challenge to lose weight. She became much fitter. Then came the big swim. “I practiced on Windermere lake,” she said. “it’s about half the distance of the Channel so I just doubled it, added some extra time, and worked out I could probably get to Calais in about 16 hours.”

Her husband David, trainer, official observer and friend sailed alongside her on a boat. She said, “I sang to keep myself going. When they told me I was a record breaker I thought they were just having a joke—until I realized it was the record for the slowest crossing. But maybe next time I might be a bit quicker.”

小题1:According to Paragraph 1, Mrs Cobell_____________.

A.started to learn swimming five years ago

B.arrived at Calais on late Sunday morning

C.wanted to break the record for the slowest crossing

D.was too exhausted to move after crossing the Channel小题2: Why did Mrs Cobell spend so much time crossing the Channel?

A.Because the tides changed her direction.

B.Because she was not in good condition.

C.Because she wasn’t good at swimming.

D.Because the winds kept her from swimming fast.小题3:Mrs Cobell crossed the Channel for the main purpose of____________.

A.taking a risk

B.losing more weight

C.raising money for charity

D.becoming famous worldwide小题4:How did Mrs Cobell feel about the record she set?

A.Dissatisfied

B.Excited

C.Annoyed

D.Proud