6．_____ makes the working class differ from peasants is longer periods of employment and more fixed incomes．（　　）
A．ThatB．HowC．WhatD．Whether

分析 使工人階級(jí)不同于農(nóng)民的是一個(gè)較長(zhǎng)的就業(yè)時(shí)期和更靈活的收入．

解答 答案：C．
根據(jù)is longer periods of employment and more fixed incomes說(shuō)明前面整句是主語(yǔ)從句，而主語(yǔ)從句  makes the working class differ from peasants可知句子不完整，缺主語(yǔ)什么，what，故選C．

點(diǎn)評(píng) 本題考查主語(yǔ)從句的連接詞，在充分分析句型基礎(chǔ)上便能選出正確答案．

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