The author gives substance to the passage through the use of___________.A.interviews with authorities in the field of water controlsB.opinion and personal observationsC.definitions which clarify important termsD.strong argument and persuasion
The author gives substance to the passage through the use of___________.
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
B.opinion and personal observations
C.definitions which clarify important terms
D.strong argument and persuasion
参考解析
解析：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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