阅读下列的短文，按照句子结构的语法性和上下文连贯的要求，在空白处填入一个适当的词或使用括号中的词语的正确形式填空。

The Internet has become part of young people’s life.   小题1:   report shows that 38% of students often use the Internet. Most of them get  小题2:   (use) information on the Internet   小题3:   use the Internet to help in their studies. But many students don’t use it  小题4:   a good way. Some play games too much, some visit websites they shouldn’t look  小题5:.So bad things may happen  小题6: students spend too much time on the Internet.

  小题7:  is important for students to use the Internet properly. Now we have a textbook,                     ____小题8:_____uses many examples to teach students some good ways to use the Internet. It gives useful ____小题9:___(advise).

Some students also make friends on the Internet. But if you want to have a face-to-face  小题10:(meet) with your online friends, let your parents know and meet in a proper place.

关于细胞周期蛋白，叙述正确的有（）.

A.在细胞周期中呈时相性表达

B.细胞周期依赖的蛋白激酶（CDKs）呈时相性激活

C.可与CDKs结合并激活之

D.CDKs通过对底物的泛素化作用驱动细胞周期的进展

E.CyclinD和CyclinE等细胞周期蛋白是原癌基因