某草原有草、兔、狐、狼四类生物，下列关于叙述中，正确的是（ ）
A：兔、水分、温度是影响草生活的生物因素
B：兔的体色一般与栖息环境一致，利于躲避敌害，这说明生物能影响环境
C：过度养殖兔子会破坏草场，说明生态系统调节能力有一定限度
D：兔、狐、狼的能量和物质的最终来源于草
It ____(snow)heavily last night．So I ____(ask)a few friends to the park this morning．The trees, the houses and the roads．____(be)all white．We ____(decide)____(make)a big snowman on the road．We ____(put)a carrot in the snowman's head．That ____(be)the snowman's nose．The two small black balls in his face were the snowman's eyes．Then we started ____(sing)and ____(dance) round the snowman．We ____(have)a great time today．
