A：上海
B：天津
C：北京
D：广州
My brother is tall. But I am _________.
His poem won the first in the contest.
细菌、真菌培养的一般步骤是（ ）
①高温灭菌 ②接种 ③配制含有营养物质的培养基 ④恒温培养．
