We students should learn to ____ ____ ____ our parents by washing clothes, helping with some housework and going to and back from school alone.
阅读下列对话,判断正误。
Miss White:Boys and girls ,we have three new friends today.
Mary: Hello, I’m Mary. I'm from the UK.
Lily : Hi, I'm Lily. I'm an English girl, too.
Zhang Shan: Hi, I'm Zhang Shan. I’m from Beijing.
Boys and girls: Welcome!
某生物学习小组同学为探究馒头在口腔中发生的变化进行如下实验,根据实验现象回答有关问题:
试管
食物
加入物质
处理
温度
试剂
现象
1号
馒头碎屑2克
清水2毫升
搅拌
置于37℃温水中
碘液
变蓝
2号
唾液2毫升
不变蓝
3号
小块馒头2克
不搅拌
4号
0℃