参考答案

正确答案：C
解析：这道题问Mr．Barlow离开他第一份工作的原因是什么。答案可以从第四段 Mr．Barlow的答话中找到。But the real reason for leaving was…大意是由于产品质量不佳，因此他在向家庭主妇推销产品时，无法诚心诚意地销售。这与C选项he found it difficult to say they were good brushes when he knew they were not意思相同，故C为正确答案。A选项he found it difficult being sincere to housewives after walking so far不对，不能诚心诚意的原因并不是after walking so far。B选项和D选项均与原文意思不相符。