In face of the challenge for the moment it’s most important to a good state of health.A.

问题补充：

In face of the challenge for the moment, it’s most important to a good state of health.

A. keep up

B. keep away

C. keep off

D. keep out

答案：

(答案→)A. keep up

B. keep away

C. keep off

D. keep out

解析：动词短语辨析。A保持,维持;继续进行,坚持；B不接近;使离开；C驱散；避开；防止；不接近；D把…挡在外边；句意：目前面对着挑战，最重要的是保持良好的健康状态。根据句意选择A。