OG11th_97题与102题

97  The stars, some of them at tremendous speeds, are in motion just as the planets are, yet being so far away from from Earth that their apparent positions in the sky do not change enough for their apparent positions in the sky do not change enough for their movement to be observed during a single human lifetime.

正确答案是B

B Like the planets, the stars are in motion, some of them at tremendous speeds, but they are

我的问题是为什么这里用THEM  而不用WHICH ,是同位语吗,或者本身就可以通用?OG答案没有说明.

但是在102中,就不用THEM

102 Beatrix Potter, in her book illustrations, carefully coordinating them with her narratives, capitalized on her keeen observation and love of the natural world.

 正确答案是C

C In her book illustreations, which she carefully coordinated with her narratives, Beatrix Potter

我说说我的理解.

97中,some of which都应该是正确的答案的,定语从句;而some of them at...是同位语.过了几遍OG,感觉GMAT在可以用同位语和定于从句的时候,倾向使用同位语.是preference的问题,而不是正确性的问题.

而102, them是像指代illustration,但代词不能指代介词短语里面的名词. 而且这题是contruction的问题,注重于句子的结构.