It is a lifestyle to eat a balanced diet and take enough exercise. A. health B. healthy C

问题补充：

It is a lifestyle to eat a balanced diet and take enough exercise.

A. health B. healthy C. unhealthy D healthily

答案：

解析：首先根据题意可知是健康的生活习惯，因此排除C而且是选项是用来修饰名词lifestyle,所以在这里应选个形容词，A是名词，B是形容词，D是副词，因此此题选B