Taking regular exercise and eating a balanced diet are two important keys ________ good health.
A．inB．from
C．ofD．to
D
D 考察介詞。句義：定期做運(yùn)動(dòng)和保持均衡的飲食是保持身體健康的兩個(gè)關(guān)鍵點(diǎn)。Key意為關(guān)鍵，鑰匙；后面接介詞to，故答案為D。
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