Algae are able to use solar energy to produce hydrogen when_____.

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• 1Scientists study how photosynthesis works because they want to_____.

  A.improve the efficiency of it.

  B.turn plant sugars to a new form of energy.

  C.get more sugars and starches from plants.

  D.make green plants a new source of energy.

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• 2How do plants relate to solar energy、

  A.They have been using it for billions of years.

  B.They are the real experts in producing it.

  C.They have been a source of it.

  D.They have been used to produce it.

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• 3The robotic technology for surgeries on people has brought a handsome Medrobotics.

  A.Right

  B.Wrong

  C.Not mentioned

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• 4Zenati tested the robot on people after using it in pigs.

  A.Right

  B.Wrong

  C.Not mentioned

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• 5The application of a thin robotic snake makes heart surgeries less time-consuming.

  A.Right

  B.Wrong

  C.Not mentioned

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• 6Researchers find it difficult to make algae produce hydrogen efficiently because_____.

  A.it is hard to create an airfree environment.

  B.it is expensive to remove the sulfate from the environment.

  C.removing the sulfate slows down hydrogen production.

  D.the algae’s cells work slowly if there is no oxygen in the air.

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• 7What does Ghirardi say about algae、

  A.They can be a good energy source.

  B.They grow faster in a reactor.

  C.They will be planted everywhere.

  D.They are cheap to eat.

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• 8What is the main idea of this passage、

  A.Public lands play an important role in energy production.

  B.Public lands are one of the main sources of revenues.

  C.Public lands should be developed to ease energy shortage.

  D.Public lands store huge energy resources for further development.

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• 9Which of the following statements is true of public lands in the U.S.、

  A.Half of US energy is produced there.

  B.The majority of undiscovered natural gas is stored there.

  C.Most of coal was produced from there in 2000.

  D.Most energy resources are reserved ther

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• 10Geothermal resources, wind turbines, and hydropower facilities in Paragraph 4 cited as examples to illustrate that_____.

  A.alternative energy production is no less than conventional energy production.

  B.the amount of alternative energy production from public lands is huge.

  C.they are the most typical conventional energy resources from public lands.

  D.geothermal resources are more important than the other two.

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