择其善者而从之，____。 《论语·述而》
下述杂交育种能产生骡的是( )
— Linda won first prize in the English speaking competition last week.
—Yes, she didn't let her teacher down.
在生产实践中,人们经常利用____和____等无性生殖的方式来栽培农作物和园林植物。
