Everything will be all right. We must never stop taking a(n) attitude towards life.
A. understanding
B. opposite
C. relaxed
D. optimistic
网友回答
A. understanding
B. opposite
C. relaxed
(答案→)D. optimistic
解析：据Everything will be all right可知，我们应该对生活保持“乐观”态度。optimistic: 乐观的。understanding, 理解的、体谅的；opposite, 相反的；relaxed, 放松的，均不合题意。故答案为D.