Either you your sister because one of you must stay at home.
A:or, goes
B:nor, go
C:or, go
吃水果、蔬菜时要注意的事项是( )
如让你设计一个实验证明光合作用需要叶绿体,应选用
1517×8+1517×7+1517 =( )
4+4=____
4+2=____
3+3=____
5+2=____