People are advised to lay particular the need of a balanced diet and proper exercise. A.

问题补充：

People are advised to lay particular the need of a balanced diet and proper exercise.

A. stress on

B. importance of

C. stress to

D. attempt at

答案：

(答案→)A. stress on

B. importance of

C. stress to

D. attempt at

解析：考查固定搭配。lay particular stress on sth把重点放在......上；注重；强调。句意：（专家）建议人们把重点放在平衡饮食和适当的锻炼上。故选A。