A：优良品种的快速繁殖
B：培育无病毒的植株
C：拯救濒危植物
D：培育新的植物品种
下列哪项为无性生殖和有性生殖的最大区别（ ）
⑴What colour is her dress ?____ A、It's Mike's .
⑵What time is it now ?____ B、It's white and black .
⑶Whose is this ?____ C、They are apples .
⑷What are they ?____ D、No , she isn't .
⑸Is your mother at home ?____ E、It's five o'clock .
