回答下列有关食物链、食物网的问题：
(1)该食物网共有__________条食物链。
(2)图中兔属于________消费者，第________营养级。
(3)图示生态系统的成分还应该有____________。
(4)若蛇的体重增加1千克，至少需要消耗绿色植物__________千克。
(1)3
(2)初级；二
(3)分解者、非生物的物质和能量
(4)25
| 完形填空。 | |||
| One morning, a crow (乌鸦) sits __1__ an apple tree. There __2__ some meat in her mouth. She wants to give it to __3__. __4__ old fox looks for (寻找) his food. He __5__ the crow and the meat. He wants to get the __6__. So he says to the crow, "Good morning, Mrs. Crow. __7__ are you?" But the crow doesn't say a word. So the fox says to the crow again, "You are nice.Your clothes (衣服) are nice, too. I like your songs __8__. Please sing a song for __9__." Mrs. Crow is very happy. So she opens her mouth and sings. The meat drops down (掉下) into __10__ mouth. | |||
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