问题 选择题

把一小块白磷放在空气中加热到40℃时就能燃烧,但将其置于盛有80℃水的烧杯中,却并不燃烧,其原因是(  )

A.温度没有达到着火点

B.白磷的质量太少了

C.白磷没有与氧气接触

D.温度太高,使白磷熔化了

答案

白磷放在空气中加热到40℃时就能燃烧,既与氧气接触,又达到了白磷燃烧的着火点,具备了燃烧的条件,置于盛有80℃水的烧杯中虽然温度达到了着火点,但不能与氧气接触.

故选C.

阅读理解

For the past two years, 8-year-old Harli Jordean from Stoke Newington, London, has been selling marbles(弹珠).His successful marble company, Marble King, sells all things marble-related—from affordable tubs of the glass playthings to significantly expensive items like Duke of York solitaire(独粒宝石)tables—sourced, purchased and processed by the mini-CEO himself.

“I like having my own company. I like being the boss,” Harli told The Mirror.

With profits now in the thousands, “the world's youngest CEO” has had to get his mother and older brothers to help him meet the growing demand.

Harli launched Marble King after swapping(交换)marbles at school led to schoolchildren depleting(削减) his marble collection. Yes, he literally(确切地)“lost his marbles.” Harli and his mother, Tina, turned to the Internet to find replacements.

Harli saw an empty space online: the marbles he wanted were hard to find. Within months, Harli had his own marble-selling website and orders started pouring in.

Tina says her son's obsession(迷恋) with marbles started when he was just 6.

“His obsession became so big we started calling him the Marble King, so when he wanted to set up a website it was the natural name for it,” she told The Sun.

“I never thought it would become so popular—we are struggling to cope with the number of orders at times.”

The 8-year-old boy has his sights set on expanding his business and launching his own brand of marbles.

“Sometimes his ideas are so grand we have to scale them back a bit. But his dream is still to own Britain's biggest marble shop and open stores around the world.” Tina told The Daily Mail.

“At the minute he is annoying me by asking about creating his won Marble King marbles, so that could well be the next step for him.”

小题1:Why did Harli's marble company become popular as soon as he launched it?

A.Because it was run by “the world's youngest CEO”.

B.Because it filled the gaps of marble business.

C.Because Harli was fascinated with marble collection.

D.Because his mother and brothers helped him a lot.小题2:How many mass media are mentioned in the passage?

A.One.

B.Two.

C.Three.

D.Four.小题3:Which of the following is closest in meaning to the underlined expression “scale back”?

A.make smaller

B.carry out

C.turn down

D.frighten away小题4:What message do the last two paragraphs carry?

A.Conflicts often occur between Harli Jordean and his family.

B.Harli's mother and brothers are worried about Marble King's future.

C.Marble King marbles will be more popular with marble fans around the world.

D.The “Marble King” has great ambitions for his Marble King Company.

单项选择题