清色的生虾，煮熟后会变红．一些同学认为这种红色物质可能像酸碱指示剂一样，遇酸或遇碱会改变颜色．这些同学的看法属于科学探究中的（ ）
A：实验
B：假设
C：观察
D：做出结论
下列运算正确的是（ ）.
A
Fascinating Plant Show
All kinds of plants from all over the world will surprise you!
Time: 8:00 am—6:00 pm, May 1st—May 10th
Ticket price: ￥10
Place: People's Park
Traffic: No.1 Bus, No.10 Bus, No.12 Bus
Welcome to the Biggest Gardening Club!
Do you like gardening? Do you want to learn how to plant flowers? Please come to the Gardening Club.
Time: 10:00 am—4:30 pm, Wednesday—Sunday
Tel: 15831777899
Mr. Mango's Fruit Store Sale
We have all kinds of fresh fruits on sale. Do you like apples? We have red apples for only ￥2/kilo. We also have mangoes(芒果) for￥6/kilo, watermelons for￥1/kilo and pears for ￥2/kilo. Come and see by yourself.
Time: 8:00 am—8:00 pm
Hotline: 5684764
在蚕豆根尖上画上等距离的细线，培养一段时间就会发现细线之间距离最大的是
