No senator spoke at the convention unless he or she was a Democrat. No Democrat

游客2024-01-13 54

问题 No senator spoke at the convention unless he or she was a Democrat. No Democrat both spoke at the convention and was a senator. Which one of the following conclusions can be correctly drawn from the statements above?

选项 A、No one but senators spoke at the convention.
B、No Democrat spoke at the convention.
C、Only Democrats spoke at the convention.
D、No senator spoke at the convention.
E、Some Democrat senators spoke at the convention.

答案 D

解析本题推理为：Senator演讲→必为Democrat→不能二者兼得。作为归纳，(D)与上面的推理完全吻合。

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No senator spoke at the convention unless he or she was a Democrat. No Democrat

Youcan’thearwhatI’msaying______youstoptalking.A、onlyifB、unlessC、lest

Ican’tfinishtheworkintime______youhelpmetranslatethetexts.A、unlessB、

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()thereisfreshair,thereisoxygen.A、WhereverB、WheneverC、UnlessD、Whether

Bequick,______you’llmissyourflight.A、otherwiseB、unlessC、andD、ratherA本题考

Don’t______thecamera______unlessyouaresureyoucanputittogether.A、take:o

Youcan’thearwhatI’msaying_________youstoptalking.A、ifB、unlessC、lestD、e

NosenatorspokeattheconventionunlessheorshewasaDemocrat.NoDemocrat

Politician:Unlessournationredistributeswealth,wewillbeunabletoallevia

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【B1】[br]【B5】[audioFiles]audio_eufm_j01_252(200910)[/audioFiles]convenience根据前

[originaltext]ThenumberofgirlsmarriedinAfricaisexpectedtodoublei

以发送方向接收方传递一段交易信息为例，数字信封技术是指（）。A.用接收方的公钥

给定关系R（A1，A2，A3，A4）上的函数依赖集F={A1→A2A5，A2→A

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Don’tthecameraunlessyouaresureyoucanputittogether.A、take:o