某动物产生基因型为AB、Ab、aB、ab四种精子(无交叉互换,和基因突变),下列说法正确的是A.这四种精子可能来自同一个精原细胞 B. 这四种精子可能来自两个精原细胞C.这四种精子可能来自一个次级精母细胞 D.这四种精子可能来自两个次级精母细胞
Michael visits many websites about Chinese culture.( )
learn
learned
to learn
Foreigners often use body language to show feelings.( )
they
their
theirs
Excuse me. Where is the nearest bookstore?
Go Center Street and you' ll find it.( )
for
along
with
There is map of China on the wall in my bedroom.( )
a
an
the
Would you like to go fishing with me tomorrow?
.It's my favorite.( )
of course not
That's right
Sure,I'd love to
I'm afraid I can't