A define是定义的意思.原句意思：因为很多人有时把工作和劳动混淆,因此很难定义“工作”
C infect是感染的意思.原句意思：电脑病毒一旦依附上主程序,它就会感染其他程序
C turn to表示寻求帮助的意思 原文意思：他受到攻击之后,他拿出手机寻求帮助
B emit是排放的意思 原文意思：更重要的是,燃料电池排放的副产品只有水和热.因此他们比目前使用的燃料更受青睐
C 此题使用的是现在完成进行时.因为全球变暖的影响还在持续
1.It is difficult to ______ work as it is so
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