Tokeephealthy，ProfessorJohnson

問題詳情：

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

【回答】

A　take up意為“開始從事(某種運動、活動等)”，符合題意；catch on意為“抓牢”；carry out意為“實現”；make for意為“有助於”。

知識點：動詞

題型：選擇題