gre阅读练习每日一篇(十六)_GRE阅读

　　26. The passage provides information that would answer which of the following questions?

　　 What is likely to be the principal source of deuterium for nuclear fusion power?

　　 How much incidental radiation is produced in the deuterium tritium fusion reaction?

　　 Why are scientists exploring the deuterium-tritium fusion reaction with such zeal?

　　 Why must the tritium for nuclear fusion be synthesized from lithium?

　　 Why does the deuterium-tritium reaction yield both alpha particles and neutrons?

　　27. Which of the following statements concerning nuclear scientists is most directly suggested in the passage?

　　 Nuclear scientists are not themselves aware of all of the facts surrounding the deuterium-tritium fusion reaction.

　　 Nuclear scientists exploring the deuterium-tritium reaction have overlooked key facts in their eagerness to prove nuclear fusion practical.

　　 Nuclear scientists may have overestimated the amount of lithium actually available in the Earths crust.

　　 Nuclear scientists have not been entirely dispassionate in their investigation of the deuterium-tritium reaction.

　　 Nuclear scientists have insufficiently investigated the lithium-to-tritium reaction in nuclear fusion.

答案：17-27：EADBCEBDCAD

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