The first study to compare honesty across a range of communications media has found that people are twice as likely to tell lies in phone conversations as they are in emails.

　　分析主干：The first study... has found that...

　　不定式to compare...作定语修饰the first study，that 引导的从句至句末，作found的宾语。宾语从句用了同级比较结构as... as，句中，是they are likely to tell lies inphone 和they are in emails 进行比较。

　　译文：第一个在各种不同的通讯媒介中对比诚实度的研究发现，人们在电话谈话中说谎的可能性是他们在电子邮件中说谎的可能性的两倍。