问题
选择题
Taking regular exercise and eating a balanced diet are two important keys ________ good health.
A．in
B．from
C．of
D．to
答案
答案：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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