如图表示的是纯净物、单质、化合物、含氧化合物、氧化物、碱之间的包含、不包含关系，若整个大圆圈代表纯净物，则在下列选项中，能正确指出①、②、③、④、⑤所属物质类别的是(  )

新华中学学生会拟举行一次以“书之旋律”为主题的读书节，请你参加并完成以下任务。

A. Amy likes Christmas Day. She can get some gifts.

B. Oliver's favorite day is Mother's Day. He can help his mother.

C. Wu Yifan likes Teachers' Day. He will give flowers to teachers.

D. Zoom likes his birthday best. He can eat good food.

E. Robin likes New Year best. He can sing and play.

⑴ ____

⑵ ____

⑶ ____

⑷ ____

⑸ ____

小芳在探究影响导体电阻大小的因素时，猜想导体的电阻可能与下列因素有关：

A．导体的材料  B．导体的长度  C．导体的横截面积

为验证上述猜想，小芳用图甲的器材进行实验，其中①、②、③是镍洛合金丝，④是锰铜丝