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【单选题】
George Washington’s dental surgery is mentioned to______.A.
[A] show his primitive medical practice in the past.
B.
[B] demonstrate the cruelty of slavery in his day.
C.
[C] stress the role of slaves in the U.S. history.
D.
[D] reveal some unknow aspect of his life.
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反馈参考答案：
举一反三
【单选题】Lesson 3: 1. The writer _________________________.
A.
doesn't like buying postcards
B.
doesn't like receiving postcards
C.
doesn't like writing postcards
D.
doesn't like postcards
【单选题】对感受器的一般生理特征，不正确的论述是
A.
感受器具有换能作用
B.
感受器仅对适宜刺激发生反应
C.
感受器对刺激能产生适应现象
D.
受到刺激时可产生感受器电位
E.
感受器加上其附属装置构成感觉器官
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