19．This kind of computer is not very cheap；______，it is very expensive．（　�。�
A．or elseB．on the contrary
C．in shortD．on the other hand

分析 這種電腦不是很便宜，相反，它很貴．

解答 答案：B
解析：A：否則；要不然；B：相反；C：簡而言之；D：另一方面．根據(jù)句意"這種電腦不是很便宜，相反，它很貴．"及所給選項分析可知，本題答案為B選項；其余選項均不符合題意．

點評 本題考查介詞短語，做此類題目時一定要清楚各個選項的含義及用法；再結合句意及其它要求確定最終答案．

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