David watches TV six hours a day and eats much junk food but he never exercises. So he is

问题补充：

David watches TV six hours a day and eats much junk food, but he never exercises. So he is .

A. healthy

B. unhealthy

C. serious

D. smart

答案：

A. healthy

(答案→)B. unhealthy

C. serious

D. smart

解析：四个选项含义分别是健康的、不健康的、严重的和精明的。从前文David一天看六个小时电视，吃许多垃圾食品，从不锻炼，因此身体应是不健康的，所以选B。