Knowledge and learning are important if we want to be successful but they may also our th

问题补充：

Knowledge and learning are important if we want to be successful, but they may also our thinking.

A. direct

B. limit

C. change

D. improve

答案：

A. direct

B. limit

C. change

D. improve

解析：动词词义辨析。A指导；B限制；C改变；D改善；句意：如果我们想要成功，知识和学习很重要，但是他们也会限制我们的思维。根据句意说明B正确。