阅读下面短文，请根据所给中文正确拼写单词，使短文完整。每空限填一词。

     Don't be a couch potato. Make _____1 (肯定) that you take plenty of exercise. ______2 (人们) aren't

as active now as they were in the ______3 (过去). It's important to eat a healthy diet. Eat fresh vegetables

and don't eat fast ____4 (食物) . Stay safe in the town by crossing the road _____5 (小心地). Stay safe in

the countryside. When you go out walking, go _______6 (和……一起) someone, or tell someone where you

are _____7 (计划) to go and when you will return. ______8 (说) “no” to cigarettes and drugs: Smoking and

taking drugs are ______9 (坏的，不利的) for your health. If you follow these, you will live a ______10 (长的)

and a healthy life.

与DNA结合并阻止转录进行的蛋白质称为

A．正调控蛋白
B．反式作用因子
C．诱导物
D．阻遏物
E．分解代谢基因活化蛋白