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
网友回答
(答案→)A. strengths
B. benefits
C. techniques
D. values
解析：strengths and weaknesses优点和缺点, benefit n.益处, 好处；technique n.技巧, 手法, 技术；value n.价值, 价格。