苗圃地通常划分为（）用地和（）用地两部分。
参考答案：生产；辅助
－Mary, how did your Math test go?
－I had thought I _________, but in fact I came in the top 10% in my class.
A．should have failed
B．couldn’t have failed
C．might have failed
D．shouldn’t have failed
氡气检测仪器标定的主要注意事项有（）
A、每年至少标定一次；
B、要考虑湿度对仪器性能的影响
C、每次检测前标定一次；
D、不需考虑其他外在因素对仪器性能的影响
－I had thought I _________, but in fact I came in the top 10% in my class.