选择题:5.If you want to be an efficient learner, you must

题目内容:
5.If you want to be an efficient learner, you must_______.(本题2.5分)
A. have clear study purposes
B. be always motivated from both inside and outside
C. set grades as your ambition
D. have good study habits
参考答案:

指派问题的每个元素都减掉同一个常数,并不会影响最优方案。()

指派问题的每个元素都减掉同一个常数,并不会影响最优方案。()A错误B正确

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对公文的注释或解释一般在公文正文中采取句内括号或句外括号的方式解决(1.0分)

对公文的注释或解释一般在公文正文中采取句内括号或句外括号的方式解决(1.0分)

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