问题补充：
Drinking a lot of coffee our health.
A. is good for
B. is bad for
C. is well in
D. is good to
答案：
A. is good for
(答案→)B. is bad for
C. is well in
D. is good to
解析：
首先要考虑动名词短语做主语，其后的谓语动词用第三人称单数。Be good for表示对…有好处，其反义是be bad for对…有坏处，选B。意为：喝大量的咖啡对我们的健康有坏处。只有do well in，C错。
