Lei Feng is always ready to help others when they are in trouble and he never their reque

问题补充：

Lei Feng is always ready to help others when they are in trouble and he never their request.

A. turns up

B. turns over

C. turns in

D. turns down

答案：

A. turns up

B. turns over

C. turns in

(答案→)D. turns down

解析：本题考查短语动词的区别。turn up的意思是“将音量调高”、“出现，露面“；turn over意思是“打翻，移交；翻身”；而turn in表示“上交”；turn down表示“将音量等调低或拒绝”的意思。结合上下文的意思应该选D。