已知x-3y=-5,则代数式x2-3xy+15y的值为( )。
25
填一填,根据图画提示填单词。
1. Close your b_____________ . Please listen.
2. He has a new b_____________ , and there is a p_____________ in it.
3. My p_____________ are very cool.
4. Li Ming is a s_____________ .
5. He goes to school by b_____________ .
6. I want to fly a k_____________ in spring.
7. Do you have any r_____________ ?
8. We make a snowman in w_____________ .
9. There are all kinds of food. My favourite food is h_____________ .
10. We plant some t_____________ in spring.
下列实验仪器不能 用酒精灯加热的是( )
A.量筒
B.蒸发皿
C.试管
D.石棉网