问题补充：
As we all know , bad eating habits and a of exercise may lead to health problems .
A. lack
B. limit
C. need
D. demand
答案：
(答案→)A. lack
B. limit
C. need
D. demand
解析：考查动词。lack缺少；limit限制；need需要；demand要求。句意：我们都知道，不良的饮食习惯和缺少锻炼会导致健康问题。
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