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.

　　1. 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

　　2. 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

　　3. We can learn from the passage __________.

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

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