a g铁粉与含有H₂SO₄的CuSO₄溶液恰好完全反应，得到a g铜，则参与反应的CuSO₄与H₂SO₄的物质的量之比为（ ）

A．1 ：7

B．7 ：1

C．7 ：8

D．8 ：7

Wise people have focused the process rather than the result as it is in the process ______ we

learn and grow.[ ]

A. where      

B. in which    

C. that        

D. from which