Dozens of scientific groups all over the world have been_________ the goal of a practical and economical way to use sunlight to split water molecules.

试卷相关题目

• 1Dr. Smith failed many times but he finally _________to find a successful way to solve the problem.

  A.broke off

  B.broke down

  C.broke out

  D.broke through

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• 2Daring the ________ larrups took all the troubles to irrigate their crops.

  A.raught

  B.naught

  C.fraught

  D.drought

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• 3During the business depression half the machines in this factory were ________

  A.helpless

  B.vacant

  C.idle

  D.lonely

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• 4During the nineteen years of his career, France Battista has won the __________of a wide audience outside Italy.

  A.enjoyment

  B.appreciation

  C.evaluation

  D.reputation

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• 5During the trip Tom and I _________ driving the car. He would drive for about two hundred miles and then 1 would drive for about another hundred miles.

  A.took effect

  B.took turns

  C.made efforts

  D.turned over

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