下列关于引文的注意事项说法正确的是（）。

A、不需要引用文献、资料产生的时代背景

B、引用的法规、政策性文件要注意实效

C、引用的名言、警句和和材料可以任意截取后使用

D、引文的不同版本可以混用

You want to know what the safest place for children 77．______
is in the car The experts say the back seat is the safest for 78．______
them. The back seat is farthest away off the force of a head- 79．______
on collision(迎头撞击), which can lead serious injuries. 80．______
If your child is below 8 and weighs no more than 85 81．______
pounds, it is necessarily to fit your car with a safety seat. 82．______
Moreover, the safety seat must be held in place of on the83．______
car’s back seat. If your child do need your attention while 84．______
you driving, don’t look back with only one hand on the 85．______
wheel. You’d better stop the car. 86．______