用生长素和秋水仙素分别处理二倍体番茄的花蕾和幼苗,成熟后所获得的果实中分别含有的染色体组数是:()
A.2和4
B.2和2
C.4和2
D.4和4
参考答案:A
There are classrooms on the ground floor. One of them is ours.
A.few
B.a few
C.little
D.a little
零售商圈的形态有哪几种?