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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正确答案
B@#@B@#@C@#@A@#@C@#@A@#@A@#@A@#@D@#@D@#@A@#@D
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