It is useful to continue to deepen and （）your individual skills and abilities.(broad)

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• Which of the following could be a reference group for an individual？
• The individual aria may be divided into two kinds：the short aria and the long aria.
• The language of the individual aria is more（）.
• The authors of individual arias such as（）is among men of letters closely associated with the townsfolk society and urban culture
• In the individual medley race and the medley relay, swimming strokes are in different orders. （ ）