①鉴别一只白兔是否是纯合子 ②鉴别一株小麦是否为纯合子
③不断提高水稻品种的纯合度 ④鉴别一对相对性状的显隐性关系
A:杂交、测交、自交、测交
B:测交、自交、自交、杂交
C:杂交、测交、自交、杂交
D:测交、测交、杂交、自交
下列景观属于南方地区的是( )
You must leave now ________ you can meet your mother at the airport on time.