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4.(单选题) According to the passage, why are examinations and grades necessary in education?(本题2.5分)
A. Because they can make the difference between success and failure.
B. Because they can motivate many students to study harder.
C. Because they can check what you have gained from your studies.
D. Because they are small, artificial steps to an ultimate goal.

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出自：成都理工大学大学英语

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