问题
选择题
249. A_____ has taught us what atoms are made up of and how powerful the atom bomb is.
A．seaman
B．salesman
C．naturalist
D．Scientist
答案
D
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249. A_____ has taught us what atoms are made up of and how powerful the atom bomb is.
A．seaman
B．salesman
C．naturalist
D．Scientist
D