2. 外语
  3. Two valence states of uranium, one with a deficit of four electrons and the other one with a deficit of six, occurs in nature an

Two valence states of uranium, one with a deficit of four electrons and the other one with a deficit of six, occurs in nature an

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问题 Two valence states of uranium, one with a deficit of four electrons and the other one with a deficit of six, occurs in nature and contributes to the diversity of uranium’s behavior.
选项 A、the other one with a deficit of six, occurs in nature and contributes
B、the other one a deficit of six, occur in nature and contribute
C、the other with a deficit of six, occurs in nature and contributes
D、the other with a deficit of six, occur in nature and contribute
E、one with six, occurs in nature and contributes
答案D
解析 主语states决定了A、C、E均错，C中one多余。
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