[单项选择]Nuclear energy is seen as the new source of power for the future. Long ago (67) was thought that the atom was the smallest particle of (68) . About 60 years ago, (69) , scientists found that atoms of uranium, a sort of (70) like coal, could be split, and (81) make a lot of heat energy, (72) they were hit by large numbers of neutrons. After a lot of research, scientists found they could produce an even (73) amount of heat by splitting a (74) of atoms one after the other, in (75) is called a chain reaction. But this means that a lot of uranium is needed to (76) the fuel to produce the heat energy and the supply will (77) to an end soon. Fortunately, a new development could make uranium (78) in the production of nuclear power. There are certain types of atoms, (79) , when they hit each other (80) great speed, join together (81) o
A. it
B. people
C. what
D. there

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[单项选择]Nuclear energy is seen as the new source of power for the future. Long ago (67) was thought that the atom was the smallest particle of (68) . About 60 years ago, (69) , scientists found that atoms of uranium, a sort of (70) like coal, could be split, and (81) make a lot of heat energy, (72) they were hit by large numbers of neutrons. After a lot of research, scientists found they could produce an even (73) amount of heat by splitting a (74) of atoms one after the other, in (75) is called a chain reaction. But this means that a lot of uranium is needed to (76) the fuel to produce the heat energy and the supply will (77) to an end soon. Fortunately, a new development could make uranium (78) in the production of nuclear power. There are certain types of atoms, (79) , when they hit each other (80) great speed, join together (81) o
A. affair
B. matter
C. material
D. thing

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