题干
— did you go?
—I went to Beijing with my parents.
A：What
B：Where
C：How
答案(点此获取答案解析）
B
— did you go?
—I went to Beijing with my parents.
A：What
B：Where
C：How
是以MN为轴的对称点，而点 
、A是以PQ为轴的对称点，求证：点 
单个细胞培养成了可育的植株