To make members of a team perform better, the trainer first of all has to know their and weaknesses.
A. strengths
B. benefits
C. techniques
D. values
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(答案→)A. strengths
B. benefits
C. techniques
D. values
解析：词义辨析。本题为人教版教材第三册P95 Language Practice Part 2 第一段的原句。根据weakness便知道：要知道他们的强项和弱点。