题目内容

Taking regular exercise and eating a balanced diet are two important keys ________ good health.
A．inB．from
C．ofD．to
D
D 考察介词。句义：定期做运动和保持均衡的饮食是保持身体健康的两个关键点。Key意为关键，钥匙；后面接介词to，故答案为D。
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