题目

Marjorie Gestring        Marjorie Gestring was a springboard（跳板） diver from the United States who won the gold medal in 3-meter springboard diving at the 1936 Summer Olympics in Berlin, Germany at the age of 13 years．With the cancellation（取消） of the Olympics in 1940 and 1944 because of World War II, Gestring did not get a chance to defend her title, and her comeback attempt for the 1948 Summer Olympics failed． Bob Mathias        17-year-old American Bob Mathias won the decathlon（十项全能运动） only four months after taking up the sport．He is 20．W 与流入小肠壁的血液相比，从小肠壁流出的血液中（　　）A．氧气增加了B．二氧化碳减少了C．氧气减少了D．食物残渣减少了