在微粒体中使血红素氧化成胆绿素的酶是（）
A.血红素加单氧酶
B.胆绿素还原酶
C.葡萄糖醛酸转移酶
D.细胞色素氧化酶
E.过氧化物酶
参考答案：A
You will find as you read fiats book that you just can’t keep some of these stones to ______. You will want to share them with a friend.
A．itself
B．yourself
C．himself
D．themselves
As for most students, they find it very difficult ______ English well. [ ]
A. to learn
B. learning
C. learn
