如图所示，用酒精灯加热试管中的水，当水沸腾一段时间以后，塞子被试管内水蒸气推出，

Directions: Complete the following passage by filling in each blank with one word that best fits the context.

When you feel like feeling sorry for yourself, stop. Remind yourself that self-pity won’t get you anything worth having.

You are absolutely capable    小题1:   creating and experiencing the very best life you can imagine. When you feel like running away from your problems, stop, turn around,    小题2:   face them. Choose to become stronger    小题3:   working your way through them,    小题4:   in the long run, getting the job done is much better than endlessly putting    小题5:   off. Also, it is not all that complicated    小题6:  difficult to live with intention, discipline and focus, if you just remember to remind yourself that it is your best choice.

A life    小题7:   is positive, successful and truly fulfilling comes from the quality of the choices you make every moment.    小题8:   life you live is the life you choose, so remind yourself, again and again, to choose the best.

http://WWW.osta.org.cn这个网址中，顶级域名是______。

A．www

B．osta

C．org

D．cn

严禁柜员办理本人金融性业务，允许柜员办理本人非金融性业务。

正常生产中，加热炉风机自停造成炉火全熄后，可立即点火。

以y₁=e^x，y₂=e^-3x为特解的二阶线性常系数齐次微分方程是：

A．y″-2y′-3y=0
B．y″+2y′-3y=0
C．y″-3y′+2y=0
D．y″+3y′-2y=0