问题补充:
As we all know, exercise will help to strengthen the heart and improve circulation of the blood.
A. normal
B. average
C. regular
D. ordinary
答案:
A. normal
B. average
(答案→)C. regular
D. ordinary
解析:句意:众所周知,定期的锻炼有助于增强心脏,促进血液循环。 regular定期的,有规律的。故选C。