GWD27-Q10 to Q12

tiffany1102

up....

melissa_gao

第10题为啥不是B啊？ B选项是很好的改写啊？？？thanks

skigorush

xiaofan1016

  If the center of



NGC 4258 were a star cluster, the


(35)stars would be so closely spaced



that collisions between individual


stars would have long ago torn the



cluster apart.

如果是star cluster ,那么就会 被torn apart  即star cluster---torn aprat

        

A.     
The stars in a star cluster at the center of M87 could
exert a strong gravitational force without tearing the cluster apart.

不torn apart  不是star cluster

削弱 选A

是不是该这样？

serendipityh

同意楼上! 必须读完才行!!

    

第一段最后一行the concentration in M87 might be a cluster of a billion or so dim stars.

    

    From its speed, they calculated
that the core’s density is more than 40 times the density estimated for any
other galaxy.  If the center of NGC 4258
were a star cluster, the stars would be so closely spaced that collisions
between individual stars would have long ago torn the cluster apart.

[此贴子已经被作者于2009/10/16 21:51:38编辑过]

维小C

mark

bonfin

up

nesstang

上面的推理不对，文章中第二段星球的情况是特殊的
From its speed, they calculated that the core’s density is more than 40 times the density estimated for any other galaxy.  因此如果中心是a cluster of stars 才会造成torn apart的。。。不是a cluster直接就是torn apart.
而a选项恰恰好支持了那个观点，说明不是所有的中心都会被排除是a cluster of stars.