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【单选题】
Which of the following best expresses the essential information in the highlighted sentence? Incorrect answer choices change the meaning in important ways or leave out essential information.A.
To avoid misunderstanding, it is very important to understand the foreigners' languages.
B.
Listening comprehension is the most important among the four skills: listening, speaking, reading and writing.
C.
In order to get full understanding, we should speak to them as often as possible.
D.
What we speak to them is as important as what they speak to us.
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【简答题】构建( )既是中国外交的崇高目标,也是世界各国的共同责任和历史使命。A. 和谐社会 B. 大国关系 C. 人类命运共同体 D. 结盟关系 B. 大国关系 C. 人类命运共同体 D. 结盟关系
【简答题】对于一个图G，若边集合E（G）为有向边的集合，则称该图为（）。
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