小种专化抗病性
参考答案:
对专性寄生物或部分兼性寄生物,寄主的抗病性可以仅仅针对病原物群体中的少数几个特定小种,称为小种专化抗病性。
It is not enough only________ the rules of grammar if you want to learn English well.
A.keeping in the mind
B.to keep in mind
C.to keep in your mind
D.keeping in your mind
满族实行一夫一妻制,结婚时,新娘要在( )上坐帐一日,称“坐福”。
A.东炕 B.西炕 C.南炕 D.北炕