—What can we do to prevent (避免)being ill?—We should do more exercise and eat a diet to ta

问题补充：

—What can we do to prevent (避免)being ill?

—We should do more exercise and eat a diet to take good care of .

A. balanced; us

B. balance; ourself

C. balanced; ourselves

D. balancing; our

答案：

A. balanced; us

B. balance; ourself

(答案→)C. balanced; ourselves

D. balancing; our

解析：句意：为了防止疾病，我们能做什么？——我们应该多锻炼，并且吃均衡的饮食来照顾我们自己。结合语境可知前文用形容词作定语，下文用反身代词作宾语，故选C，balanced平衡的；ourselves我们自己。