骨性关节炎的好发年龄()
A.65岁以上
B.55~65岁
C.45岁以下
D.35岁以下
E.45~55岁
参考答案:A
—You are always full of ________.Can you tell me the secret?
—Taking plenty of exercise every day. [ ]
A. power
B. strength
C. force
D. energy
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