Autumn is the ____ (busy) season of a year. Look! The farmers are working in the field.
选词填空。
A. This is Mary. She's nine. She's tall. She's thin.
B. This is Danny. He's six. He's short. He's fat.
C. This is Eddie. He's nine. He's short. He's thin.
选项
实验
操作顺序
A
蛋白质的鉴定实验
双缩脲试剂A液和B液混合均匀后再加入
B
探究温度对酶活性的影响
先将酶和底物充分混合,后设置系列的温度梯度
C
观察植物细胞有丝分裂
先用清水洗去解离液,后用碱性燃料对染色体染色
D
低温诱导染色体数目加倍
先制作根尖细胞临时装片,后放入冰箱中低温诱导
小芳和小明在手工课上各自制作楼梯模型,他们用的材料如图,则( )