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根据短文内容及各空中所给的首字母，填写一个适当的词，使短文意思完整且符合逻辑。

     People often left school and started working early in the past. But today, lifelong learning is becoming

q    1    common. Lucy is forty years old. She teaches physics at a c   2    in Boston. "Next term, I'll give

some of my lessons b   3    using the Internet. This is a way of teaching, but it's also a good c   4    to

study," says Lucy. "These days, I am taking classes to learn h   5    to teach on the Internet. If I don't

study, I will l   6    my job." At the same time, Lucy's parents are taking art history lessons on the

Internet. They are both seventy years old and live in New York. "We love this s   7    ,"says Lucy's father, "and we are doing it to entertain ( 使快乐) o   8    . You see, through the Internet, we can study with

people from all over the world. What f   9    it is to learn like this!" What do you think of Lucy's family?

Are you studying now? If you aren't, do it q  10   . Take up your books and learn all your life!

重介质旋流器选煤工艺流程中给料方式有哪几种？各有何优缺点？

肺癌¹⁸F-FDGPET显像时，肿瘤组织摄取显像剂相关因素有（）。

A.特异性结合

B.细胞膜葡萄糖转运体-1

C.细胞膜Na⁺-K⁺ATP酶

D.显像剂与血浆中转铁蛋白结合

E.线粒体膜两侧电位差

直流电动机反接制动时，当电动机转速接近于零时，就应立即切断电源，防止（）。

A、电流增大

B、电机过载

C、发生短路

D、电动机反向转动

士官入学前的军人保险账户由原单位封存，个人账户资金继续计算利息。