要把两个不同物种的优良性状集中在一起,应采用的育种方法是[ ]
A.杂交育种
B.单倍体育种
C.诱变育种
D.基因工程育种
答案:D
在委托有效期内,只要证券经纪商按委托内容代理买卖,委托人就不得拒绝接受交易结果。( )
读下列句子写出相应的问句或答语。
1. Where is your school?
2.
I'm going to visit my friends.
3. What are you going to buy on the weekend?
4.
I'm going to the bookstore this afternoon.
5.
I am going at 3 o'clock.