Lack of sleep has ______ her concentration.

Lack of sleep has ______ her concentration.
A、deconstructed
B、impaired
C、demonstrated
D、repaired
【正确答案】：B
【题目解析】：缺乏睡眠（损害）了她的注意力。A. deconstructed 解构, 拆析
B. impaired 损害，削弱

C. demonstrated 展示; 显示; 论证

D. repaired 纠正; 补救