21.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.changing the sunlight and water into electricity directly
D.providing electricity for the poor family at a low cost
22.According to the passage, catalysts in the artificial leaf________.
A.speed up the process of chemical reactions
B.reduce the loss of energy during its operation
C.work as a media to store collected energy
D.slow down the course of chemical reactions
23.The underlined word“it”in the fourth paragraph refers to______.
A.photosynthesis
B.catalyst used by the solar cell
C.Turner’s artificial leaf
D.Nocera’s new leaf
24.The passage is most probably from_________.
A.a science fiction story
B.a fairy tale book
C.an advertisement for solar products D.a science news report
B
When learning a second language,it is important to study the culture of the language you’re learning.Anyone can learn another language’s grammar from a textbook,but what good is this learning if you don’t understand the culture of the person you’re speaking to? Only in learning another language and its culture will you be able to proficiently communicate with a
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