新GRE小短文阅读练习题三十五

会计考友

The percentage of children who wear glasses has increased signifi-
0 k, q6 Y9 A; q0 {7 H+ [cantly over the past thirty years.  Since  the methods used to diagnose
vision impairments are the same as they were thirty years ago , the
reason for this increase must be that a higher percentage of children
8 l3 o$ s+ |# `# ?5 ]' Khave poor eyesight today than thirty years ago.
! O' j4 T& Y! h/ p In the argument given, the part that is underlined plays which of the
4 }( W9 g3 X/ o/ E% |' Zfollowing roles?
! w) V: T+ A+ T9 J6 a# y: D
5 Y6 a% C3 b8 h  ^  |/ E$ X     A  Describing the circumstance that the argument seeks to explain  
   B   Stating the position to be refuted by the argument  
$ y: |/ j$ Z, v0 W8 m" N( P6 G" x     C Serving as an intermediate conclusion that supports a further
       conclusion stated in the argument  
6 q0 K$ U9 @' q8 H( D4 r    D  Providing an illustrative example that neither strengthens nor
       weakens the argument  
    E  Providing support for the conclusion of the argument by excluding
6 N3 K$ Q2 O( e       an alternative explanation of the phenomenon to be explained  
答案：C