It is not how much we do but how much love we put into what we do _______ matters. [ ]

A. who    

B. which  

C. whom    

D. that

右图表示过氧化氢在不同条件下被分解的速率，图中曲线表明酶的（）

A.专一性

B.高效性

C.催化需要适宜的温度

D.催化需要适宜的pH