2012年12月大学英语六级阅读专项练习题17 " U" n4 m: |* v0 p" w6 x' i+ J1 A5 C; d
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1．What is the topic of the passage? . v9 h, M' r- l% V' X 2．Where was ice used after the Civil War? 1 ?# Q- n: ], r4 p+ i
3．What was essential to a science of refrigeration according to the passage? ! D' I q, T) M- t1 Z9 i8 R, l
4．It can be inferred from the passage that the theoretical foundation of ice box should be that____________. 5 H* n* f2 L. R9 v+ ]" V# u 5．Without an ice box，farmers had to go to the market at night because_______.
发表于 2012-8-14 10:30:44
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