Question

To keep healthy, Professor Johnson ______ cycling as a regular form of exercise after he retired.

A．took up

B．caught on

C．carried out

D．made for

Answer 1

A

句意为：为了保持健康，Professor Johnson 退休后开始骑自行车来作为一种定期的锻炼形式。take up 开始工作，从事某项活动，所以选A 。