To keep healthy, Professor Johnson _____...

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

A. carried out B. caught on C. took up D. made for

C 【解析】试题分析：考查动词短语。在退休后，为保持健康，约翰逊教授开始把骑自行车作为一项固定的锻炼方式。carry out开展； catch on变得流行； take up开始从事； make for导致，有助于。故选C。考点：考查动词短语。

考点分析：

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