One of the most effective ways to reduce is to talk about feeling with someone you trust.
A:production
B:stress
C:energy
D: passive
f(x)dx的值为( )
I can teach you to swim.
每天早上和傍晚都会有很多人在绿树成荫的公园中锻炼身体,他们认为这个时间的空气质量比较好.请结合你所学的知识,就空气中氧气含量而言,你认为一天中比较适宜锻炼身体的时间是( )