but a_____of nickel and silicon Hemdon has a truly revolutionary notion：Within the nickel silicideinner core is also aninnerinner corean 8 kmwide ball of the element uranium.Uranium is radioactive.Hemdon thinks the uranium releases heat energy as its atoms_____fission-split and crash into another in a chain reaction. In other words,we may live on top of a gigantic, naturalnuclear power plant.

　　51 A try B leave C turn D point

　　52 A create B receive C feel D overcome

　　53 A work B solution C job D patterns

　　54 A whether B what C why D how

　　55 A from B within C of D to

　　56 A followed B dominated C restored D opposed

　　57 A ideas B demands C phenomena D movements

　　58 A things B acts C methods D records

　　59 A taken B benefited C left D kept

　　60 A after B before C since D when

　　61 A expanded B modified C gained D melted

　　62 A size B origin C structure D shape

　　63 A radical B traditional C classical D conventional

　　64 A system B copy C model D compound

　　65 A charge B last C experience D show

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