The author gives substance to the passage through the use of___________.
2023-05-26
A.interviews with authorities in the field of water controls
B.opinion and personal observations
C.definitions which clarify important terms
D.strong argument and persuasion
参考答案：B
B.opinion and personal observations
C.definitions which clarify important terms
D.strong argument and persuasion
参考答案：B
通过浏览整篇文章以及对段落首末句的分析可知，作者是在发表自己的个人观点并分层次具体阐述，所以B项正确。
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