什么叫品种？
参考答案：
种子法第74条规定：“品种是指经过人工选育或者发现并经过改良，形态特征和生物学特征一致，遗传性状相对稳定的植物群体”。
下述哪一项不是颅脑增强扫描的禁忌证
A．碘过敏
B．严重肝肾功能损害
C．脑血管性病变
D．急性颅脑出血
E．颅脑外伤
--This is the first time I ____ pictures with my own camera.
--It’s time that you ___ a picture of me.
A．took; took
B．took; will take
C．have taken; took
D．will take; have taken
