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A
valiant
B
variable
C
vigorous
D
vigilant
正确答案 :C
解析
本题考查形容词词义辨析。
句意“即使是在最好的情况下,每个学生每天会有30分钟的适度到剧烈的运动,但这都只占到了要求的一半。”分析句子,根据句意及“moderate to ______”可知,空格处指的是锻炼的强度,且是比moderate“适度的”更高级的强度。C项“强健的积极的”符合题题意。
A项:“勇敢的”,不符合题意,故排除。
B项:“可变的”,不符合题意,故排除。
D项:“警惕的”,不符合题意,故排除。
故本题答案为C。
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