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问题 单项选择题

铅抑制血红素合成酶后，体内的锌离子被络合于

A．原卟啉原
B．粪卟啉原Ⅲ
C．原卟啉Ⅸ
D．卟胆原
E．尿卟啉原Ⅱ

答案

参考答案：C

选择题

南极洲的地理特点是[ ]

A．世界上跨经度最广、纬度最高的一洲

B．目前世界唯一没有人居住的大洲

C．长城站和中山站都有极昼、极夜的现象

D．大陆上的建筑物窗户都朝南开
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选择题
— I broke my brother's notebook computer. What should I do? 
— If I were you, I ______ him right away, and then apologize for it.

A. have told
B. would tell
C. won't tell
D. could tell
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