题目

1.几个不等于零的数相乘,积的符号由负因数的________决定,
当负因数有______个时,积的符号为______
当负因数有______个时,积的符号为______
2.几个数相乘,有一个因数为零,积就为______
就画线部分提问
1.My mother works in a hospital
_____________
2.there are fifty students in our class
_____
3.I often have supper at 7 in the evening
____
4.He is reading a book on animals
_________________
5.My mother cooks meals for me every day
_________
6.I'm in Class 2
_______

提问时间：2021-03-29

答案

个数
偶数 +（正）
奇数 -（负）
0
where does your mother work?
how many students are there in your class
what time do you often have supper
what is he reading?
what does your mother do for you every day
which Class are you in?