— That's true. But he became an excellent writer at last.
A:in the middle
B:at first
C:in the end
①用植物的组织培养技术繁殖月季
②用蒜瓣繁殖大蒜
③将仙人球嫁接到仙人掌上繁育新植株
④用种子繁殖水稻
—When did your father stop smoking?
—In 1999, the year I was born.