GWD27-10 11 12

bonfin

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cheungwenhao

Q11,must infer is something that author infers to, can not be totally correct

shirleylamqin

关于Q12，题目是要削弱“　the concentration in M87 might be a cluster of a billion or so dim stars“ 这句话，也就要证明the concentration in M87 不是cluster,也就是找到cluster的特征，取反。文中最后一句话可以infer到的。