To make members of a team perform better,the trainer first of all has to know their and w

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(答案→)A. strengths
B. benefits
C. techniques
D. values
解析：语境为：要使队员表现得更好，教练员首先得清楚每个队员的优点和缺点。B项表“利益、好处”，不合题意。而A项除表体力外，还可引申为可数名词something providing force or power优点、强项，符合语境。