Recently，researchershasannouncedabreakthroughintheexplo...

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Recently，researchers has announced a breakthrough in the exploration of new energy—development of the first practical artificial leaf, an advanced solar cell that imitates the process，called photosynthesis(光合作用)，that green plants use to make sunlight and water into energy.

“A practical artificial leaf has been a dream of scientists for decades，”said Daniel Nocera，who led the research team．“We believe we have made it．The artificial leaf shows particular promise as an inexpensive source of electricity for homes of the poor in developing countries. One can imagine villages in India and Africa soon purchasing an affordable basic power system based on this technology．”

The leaf is like the shape of a poker card but thinner．Placed in water in a bright sunlight，    it could produce enough electricity to supply a house in a developing country with electricity    for a day by splitting water into hydrogen and oxygen, which are stored in a fuel cell to    produce electricity．

The“artificial leaf”is not a new concept．The first artificial leaf was developed more than a decade ago by John Turner．However, it was impractical for wider use，as it was composed of    rare，expensive metals and was highly unstable with a lifespan of barely one day．

Nocera’s new leaf overcomes these problems．It is made of inexpensive materials that are    widely available，works under simple conditions and is highly stable．Laboratory studies    showed that it could operate continuously for at least 45 hours without a drop in activity．

The key to this breakthrough is Nocera’s recent discovery of several new powerful，    inexpensive catalysts，which are able to accelerate the chemical reaction under simple    conditions．Right now, Nocera’s leaf is about 10 times more efficient at carrying out    photosynthesis than a natural leaf．Yet he is optimistic that he can boost the efficiency of the    device much higher in the future．

24．Daniel Nocera describes his artificial leaf as promising in___________．

A．making an artificial plant that can feed itself．

B．finding a new kind of catalyst to produce electricity．

C．providing electricity for the poor family at a low cost

D．changing the sunlight and water into electricity directly

25．According to the passage, The underlined word“accelerate”in the last paragraph probably means ________．

A．reduce the loss of energy               B．speed up the process

C．work as a media to store collected energy

D．control the operation of chemical reactions

26．We can learn from the passage ______．

A．There was nobody who had an idea of the artificial leaf before.

B．Nocera’s artificial leaf has advantages over Turner’s in some ways.

C．The first artificial leaf was once widely put into use in many countries.

new artificial leaf works well but can just keep operating only one day.

27．The passage is most probably from _________．

A．a science news report               B． a science fiction story

C．a fairy tale book                   D．an advertisement for solar products

【回答】

CBBA

知识点：科普环保类阅读

题型：阅读理解