（）是通过个体选择和分系鉴定，淘汰伪劣的系统，然后将选留的各_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题单项选择题

（）是通过个体选择和分系鉴定，淘汰伪劣的系统，然后将选留的各系混合脱粒，再通过与原品种的比较试验，表现确有优越性时，则加以繁殖推广。

A、系统育种

B、混合育种

C、集团混合选择育种

D、改良混合选择育种

答案

参考答案：D

填空题

先阅读短文，掌握其大意。然后从方框中所给的词中选出恰当的10个，并用其适当形式填空，每个词限用一次。

get, in take, because, school, tired, on, half, play, difficult, with, home

Hello, I’m Dave. My school is 小题1: the center (中心) of my town. But I live in the countryside, 小题2: Mom thinks it is quiet there. It 小题3: me about an hour to go to school by bike. It is 小题4: for me to get to school before eight o’clock in winter. Sometimes I am late for school, my teacher is a little angry (生气的) 小题5: me. I have to 小题6: up before five thirty in the morning. I am always 小题7: in the evening. But my friend Lucy lives in the town, and her 小题8: is not far from the bus station. She usually goes to school 小题9: foot. She can play with friends after 小题10: .

问答题

温白丸3功效与作用