o make members of a team perform better, the trainer first of all has to know their and weaknesses.
A. benefits
B. strengths
C. techniques
D. values
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A. benefits
(答案→)B. strengths
C. techniques
D. values
解析：词义辨析。A.福利；利益 B.优势；强项 C. 技术；方法 D.价值观念。句意：……培训者首先要知道他们的优势和劣势。故选B。