问题补充:
The expert says that nowadays there are too many problems linked to poor diet and a of exercise.
A. limit
B. lack
C. need
D. demand
答案:
A. limit
(答案→)B. lack
C. need
D. demand
解析:A限制;B缺少;C需要;D要求;句意:专家说现在又很多和不好的饮食和缺乏锻炼有关的问题。本句中的a lack of缺少…是一个固定搭配。根据句意说明B正确。