问题补充：
— I go to bed and get up early every day.
— That’s a good . It keeps us healthy.
A. habit
B. hobby
C. rule
D. interest
答案：
(答案→)A. habit
B. hobby
C. rule
D. interest
解析：habit习惯，嗜好；hobby嗜好，业余爱好；rule 统治，规则；interest兴趣，爱好。句意：我每天都早睡早起。——那是个好习惯。会让我们保持健康。结合语境可知选A。
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