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
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(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。