﹣2的相反数是（  ）

1956年，浙江温州有合作社曾实行包产到户，到1957年温州地区实行包产的农户占入社农户的15%，与此同时，四川、广东、安徽等省一些农业社也先后实行了包产到户。此后直到70年代，仍有一些地方曾实行包产到户。这一现象反映了(  )

阅读短文，判断正误。

      Hello,I'm Peter.  I'm from Canada.  I'm 11 years old.  I'm 1. 6 metres and 40 kilograms.  I like reading books.  Every morning, I go to school with my good friend Ben. We go to school on foot. Ben is 10 years old.  He's 2 kilograms heavier than me. But I'm 2 cm taller than him. We study in Red Wood School. Lucy is my sister. She's 1 year older than me. She likes drawing pictures. She is taller and stronger than me.

下列物体的主视图、俯视图和左视图不全是圆的是（　　）