If you are an athlete, strong abdominal muscles help you ensure a strong back an

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问题 If you are an athlete, strong abdominal muscles help you ensure a strong back and freedom from injury during ______ upper-body movement.

选项 A、valiant
B、variable
C、vigorous
D、vigilant

答案 C

解析 vigorous意为“剧烈的，强度大的”，vigorous upper-body movement表示“剧烈的上半身运动”，符合语境，故选C。valiant“勇敢的”、variable“可变的”和vigilant“警惕的”均不跟upper-body movement搭配，可排除。

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