According to Paragraph 5, electrons are released_____.
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4 .According to the first paragraph, when can we share our sweet drinks with our cell phones?
A When enzymes can be commonly found in living cells. B When the technology of producing a new type of fuel cell appears. C When the technology of a new type of fuel cell is suitable for mass production. D When the technology of mass producing cell phones appears.
5 .What trouble did Minteer and Klotzhach have in their research?
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7 .What is exciting about the new fuel cells?
A Their limitless power generation capacity is amazing. B Their limited power generation capacity is a good beginning. C Their limited power generation capacity is the result of great efforts. D Their limitless power generation capacity is a major accomplishment,
8 .According to the last paragraph, what is NOT true of the new fuel cells?
A The new fuel cells run on sugar that is easy to find. B The new fuel cells are environment friendly. C The new fuel cells are biologically degradable, D It will take some time before the new fuel cells can be used in popular products.
9 .Harry Potter is mentioned in the passage, because scientists_____.
A can now make an invisible cloak of the same kind as he uses B try to make an invisible cloak of the same kind as he uses C try to invent a device Similar in idea to the invisible cloak he uses D know that it is possible to make an invisible cloak of the same kind
10 .What is true of microwaves?
A Their wavelengths are shorter than those of visible light. B Their wavelengths are longer than those of visible light. C They are different from visible light as they are a kind of radiant energy. D They are visible to the human eye.
