题干
Asking them to boycott meetings when others do not agree with their demands is a(n) ________ to a very unhappy life of fighting with other people, ________ them their future happiness.
A：guarantee, having cost
B：accomplishment, losing
C：invitation, costing
D：affection, having lost
答案(点此获取答案解析）
C
O2+HbCO，37 ℃时，该反应的平衡常数K=220。HbCO的浓度达到HbO2浓度的0.02倍，会使人智力受损。据此，下列结论错误的是