题目

（09潍坊市一模）右图表示培育高品质小麦的几种方法，下列叙述正确的是A．图中涉及的育种方法有杂交育种、单倍体育种和诱变育种B．a过程能提高突变频率，从而明显缩短育种年限C．a、c过程都需要用秋水仙素处理萌发的种子D．要获得yyRR，b过程需要进行不断自交来提高纯合率 答案：答案：DThis is our classroom. Please _____ here. ( )A.play basketballB.don't play basketballC.can't play basketball