单选题 Exercise cart affect our outlook on life, and it can also help us get rid of tension, anxiety and frustration. So we should take exercise ______.
A. regularly B. normally C. usually D. constantly

【正确答案】 A
【答案解析】regularly定期地，经常地。normally正常地。usually通常地，平常地。constantly始终如一地，持续地。