甲、乙两物体的质量之比是3:1,吸热之比是4:1,则它们升高温度之比和比热之比可能分别是[ ]
A.3:4 1:1
B.2:6 2:1
C.3:2 1:2
D.4:1 1:3
答案:D
At school Kitty is a __________ student. She is good at all her lessons.
A.bad
B.top
C.tall
D.healthy
草地上,一只羊被一根长为4米的绳子拴着.这只羊最多可以吃到多大面积的草?