Daydreaming，science has discovered，is an ______relaxation technique.

题目：Daydreaming，science has discovered，is an ______relaxation technique.

A. effective
B. affective
C. efficient
D. affectionate

喵查答案：A

[解析] 此句意为科学家发现做白日梦是一种有效的放松方法。effective意为有效的，有用的，故选A。