题目

You want to know where the safest place for young children is in the car? For a child of any age, the back seat is the safest place and the safest part of the back seat is the middle. In the back seat, the child is farthest away from the force or effect of head-on collision（撞击）, which can cause the most injuries.        All fifty states of the USA have laws requiring the use of safety seats for young children. If you have children under 8 years of age weighing no more than 80 pounds, it is necessary to fit your car with a special child safety seat.        The child safety s下列生理活动与RNA功能无关的是 A．催化细胞内的某些生化反应         B．转运氨基酸 C．作为模板，可逆转录形成DNA      D．携带着生物体细胞内的全部遗传信息