对流层和平流层中的大气以及地球表面都可认为是处于（）平衡状态。
A、散射
B、漫射
C、辐射
D、放射
参考答案：C
—The final round of the competition is coming near. Can I really do well this time?
—Believe in ______. You’re always the best in our school.
A．you
B．your
C．yours
D．yourself
现阶段网上支付系统的种类主要有哪几种方式？
