题目选项分析

Nineteenth-century doctors thought that alcohol, when ingested, passed through the stomach into the bloodstream and was broken down only by the liver; recent studies, however, have led doctors to conclude that the stomach breaks down up to 20 percent of ingested alcohol before it reaches the liver.

Nineteenth-century doctors thought that alcohol, when ingested, passed through the stomach into the bloodstream and was broken down only by the liver; recent studies, however, lead to the doctors' conclusion that the stomach breaks down up to 20 percent of ingested alcohol before it reaches the liver.