A:In the morning, I read a book.
B:In the morning, I wash my face.
C:In the morning, I talk on the phone.
北京市位于华北平原的北部边缘,其地势特点是( )
已知豌豆的高茎对矮茎为显性,现有一株高茎豌豆甲,要确定甲的基因型,最简便易行的办法是( )