血红素合成的限速酶是（）
A.ALA合成酶
B.尿卟啉原Ⅲ合成酶
C.亚铁螯合酶
D.尿卟啉原I合成酶
E.粪卟啉原氧化酶
参考答案：A
She enjoys __________ the articles in the magazine "Zhi Yin".[ ]
A. to read
B. reading
C. read
D. reads
