题目

Make Your Mark：Canadian Blood Services     The People：The Canadian Blood Services     The Cause：Thank Your Donor     In July of 2008，the Canadian Blood Services launched a new website called http：//www．thankyourdonor.ca as a way for blood recipients（接受方）to express their thanks to donors through stories，photos，and videos．     The goal of the website is to show people how their blood donation can truly make a difference in somebody’s life．Many people were coming into blood clinics after receiving a blood donation to say thank you．The Canadian Blood 10．先化简，再求值：$\frac{{x}^{2}}{x+1}-\frac{x}{x+1}$，其中x=-$\sqrt{5}$．