问题 探究题

小兰在做早餐时发现,同样加热情况下,煮沸一锅牛奶要比煮沸同样多的水时间短,这是为什么呢?请你运用所学的物理知识,针对其中的原因,提出一个猜想,并简述验证这个猜想的办法。

(1)你的猜想:_______________________________________

(2)验证办法:_______________________________________

答案

(1)水的沸点比牛奶高

(2)

用温度计分别测出水和牛奶沸腾时的温度,然后进行比较。

或:

(1)水的比热容比牛奶的比热容大

(2)取质量相等的水和牛奶,让它们吸收相同的热量,用温度计测出它们的初温和末温,比较升高的温度,温度升高小,则比热容大。

阅读理解

Sometimes, something that is considered to be negative turns out to be an advantage on the job. Though he is only l8 years old and blind, Suleyman Gokyigit is among the top computer technicians and programmers at InteliData Technologies Corp., a large software company with several offices across the United States.

"After our company united with another one last October, two different computer networks were driving us crazy," recalls Douglas Braun, the InteliData president. "We couldn't even send e-mail to each other.” In three weeks Mr Gokyigit created the software needed to connect the two networks. "None of the company's 350 other employees could have done the job in three months," says Mr. Braun. " Suleyman can 'see' into the heart of the computer.”

Mr. Gokyigfi's gift, as Mr. Braun calls it, is an unusual ability to form an idea of the inside of a machine. "The computer permits me to reach out into the world and do almost anything I want to do," says Mr. Gokyigit

The young programmer is at home with hardware as well, thanks partly to a highly developed sense of touch. Mitzi Nowakowski, an office manager at InteliData, remembers how he easily disconnected and reconnected their computer systems during a move last year. "Through feel, Suleyman can find the position of connectors, pins and wires much faster than most other people with sight," he says.

Much of the student programmer's speed comes from his ability not to be interrupted while at the computer. When typing, he listens carefully to the synthesizer (合成器). His long, thin fingers fly over the keyboard. "Nothing seems to shake his attention," says Mrs. Nowakowski, his boss.

Mr. Gokyigit is the only company employee who is available 24 hours a day. "We consider him our top problem solver." says Mr. Braun.

小题1:According to Mr. Braun, Suleyman ________________.

A.can work wonders on computer

B.is the best technician in the world

C.has done a hard job in three months

D.has united InteliData Technologies Corp. with another computer company小题2:The underlined part "is at home with hardware" ( paragraph 4 ) means _________.

A.is good at dealing with computer hardware

B.is fond of computer hardware

C.works with computer hardware at home

D.feels comfortable when working with computer hardware小题3:Suleyman was quick while at the computer mostly because of ______.

A.his blindness

B.his attention on the synthesizer

C.his long, thin fingers

D.his ability not to be interrupted小题4:What does the text mainly tell us?

A.Computer technicians are more likely to be gifted.

B.One's disadvantages may prove to be advantages.

C.The disabled can also play an important role in society.

D.Top computer scientists have unusual abilities to form ideas of computers.

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