feifei 39怎么回 事？

 39.Quasars---celestial objects so far away that their light takes at least 500 million years to reach Earth---have been since 1963.For anything that far away to appear from Earth the way quasars do, it would have to burn steadily at a rate that produces more light than 90 billion suns would produce. But nothing that burns at a rate that produces that much light could exist for more than about 100 million years.

If the stements above are true,which one of the following must also be true on the basis of them?

A, Instruments in use before 1963 were not sensitive enough to permit quasars to be seen.

B. Light from quasars first began reaching Earth in 1963.

C.Anything that from Earth appears as bright as a quasar does must produce more light than would be produced by 90 billion suns.

D. Nothing that is as far from Earth as quasars are can continue to exist for more than about 100 million years.

E. No quasars that has ever been seen from Earth exists any longer.

不太明白怎么选E。题目已经说了，在1963年看到一个物体，quasars 。。。。第一句话说。但是E又说没有这个QUASARS存在。虽然题目后面说到，Q的光是500万年前发出，``而在400万年前这些类形体就已经不存在了。但是怎么解释第一句话，第一句话明名说在1963年看到。。。。不明白的哦

第一句：Quasars---celestial objects so far away that their light takes at least 500 million years to reach Earth---have been seen since 1963

这个句子明显主谓宾，意思很清楚，这个星体从1963年就被看到....不象你说的那样似的哦

这样与答案有出入捏

我在说一下。

先说D的错误之处：

But nothing that burns at a rate that produces that much light could exist for more than about 100 million years，而D未说这个start burning，如果不存在burning的话，那就没有disappear的理由。

再说E：

Quasars have been seen since 1963 （instead of exsit） 指的是它发出的光到达地球 （否则不可seen），所以同意sen4sun.