In the phenomenon of atomic fission, the nucleus is split into two pieces of approximately equal mass.

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问题 In the phenomenon of atomic fission, the nucleus is split into two pieces of approximately equal mass.

选项 A、doubly
B、always
C、solidly
D、about

答案D

解析  画线词approximately的意思等于D.about,即“大约、将近。”正确答案为D。辨义:A.doubly两倍的;B.always总是;C.solidly坚固地。
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