搬起一块质量为25千克的石头,至少需要 _________ 牛顿的力.(g=10N/kg)
250
玲玲给大明写了一封信,根据括号内汉语提示请你帮助玲玲把信补充完整。
Dear Daming,
Today I __ l___ to the supermarket (起市). I bought a hat __2___ my mother. It is (漂亮). But I think
it is too _4___ (大). I want to __5__ (买) you a gift. What do you want? Please tell me.
Yours,
Lingling
下列表示食物链的式子中,写法正确的是( )
A.阳光→草→兔→狼
B.羊→兔→狐狸→狼
C.鹰→兔→草
D.草→昆虫→青蛙→蛇