111． In 1951，14-year-old James Harison was hospitalized for three months.During the difficult time，Harison learned that he was alive largely due to the blood transfusion（輸血）.To give back，he became a blood donor（捐獻(xiàn)者） himself.
During the next 60 years，James Harison has made 1，173 blood donations.Australian Red Cross Blood Service says that Harison has saved about 2.4 million lives.
Harison has a
rare antibody（抗體） in his blood and in the 1960s he and health professionals used it to develop a medicine called Anti-D.Anti-D is the main answer to a deadly problem called rhesus disease，a condition where a woman's blood start s harming her own unborn baby's blood cells.Every Anti-D that has ever been made in Australia has come from James blood.
"I'd keep on going if they'd let me."But Mr.Harison has passed the donor age limit and the Blood Service seeks to protect his health.On Friday，Mr.Harison made his final donation.
He was awarded the Medal of the Order of Australia in 1999.
（1）Mr.Harison saves 2.4 million people mainly by
.
A.inventing Anti-D
B.directing blood transfusion
C.providing blood to produce Anti-D
D.encouraging people to become blood donors
（2）What's the meaning of the underlined word "rare" in paragraph 3？
A.Common.
B.Unusual.
C.Dangerous.
D.Unknown.
（3）Why does Mr.Harison stop blood donation？
A.He is seriously ill.
B.He doesn't want to donate any more.
C.He is too old to do it.
D.His blood is no longer useful.
