题目

Many objects in the universe are invisible,but they send radio waves. The radio telescope thus appeared, and it is considered one of the greatest inventions in the twentieth century. Reber built the world's first radio telescope in 1937. Ryle and Hewish developed radio telescope systems for the location of weak radio sources, and they shared the Nobel Prize for Physics in 1974. A radio telescope is usually made up of:One or more antennas to collect the radio waves. Most antennas are made in the shape of a dish to collect and reflect, the radio waves to the sub-reflector, in the same way as a c下列有关叙述中，正确的是 （ ）A．细胞分化程度越高，全能性就越高B．细胞体积越小其相对表面积越大，物质运输的效率越慢C．有的细胞增殖后仍可发生细胞的分化D．细胞的衰老就是个体的衰老