The nurse is giving instructions to a client who is going home with a cast on his leg. Which point is most critical ？（）

A．Using crutches properly.

B．Exercising joints above and below the cast, as ordered.

C．Avoiding walking on a leg cast without the physician's permission.

D．Reporting signs of impaired circulation.

幼儿园早期阅读活动的开展的首要步骤是（）。

A.教师与幼儿一起阅读

B.围绕阅读重点开展活动

C.幼儿自己阅读

D.归纳阅读内容