听写材料22.蜘蛛

正确原文：

Beforemoving on to a new topic, I want to finish up our unit on a rag nit, by lookingat what may seem a very unusual aspect of spider behavior—a species where theyoung spiders actually consume the body of their mother. Unlike most otherspiders, this species lays one and only one clutch of forty eggs in a lifetime. The young spiders hatch in mid-spring or early summer inside a nest ofeucalyptus leaves. Their mother spends the warm summer months bringing homelarge insects, often ten times their weight for meals. The catch is alwayssignificantly more than her young spiders can eat. So the mother fattensherself up on this extra prey, and stores the nutrients in her extraunfertilized eggs. As the weather turns colder, there are fewer insect prey tohunt. That’s when the nutrients stored in those extra eggs begin to seep intothe mother’s blood stream. So when there are no more insects to feed to theyoung spiders, they attach themselves to the mother’s leg joints and drawnourishment by sucking the nutrient-rich blood. After several weeks, the motheris depleted of all nutrients and she dies. But then how do the young getnourishment? They start to feed on one another. Now if you recall ourdiscussion of Darwin, you’ll see the evolutionary value of this. Only thestrongest spiders of the clutch will survive this cannibalism. And the motherspider will have ensured that her genes have an increased chance of survivalthrough future generations.

生词摘录：

1.    on a rag nit:快速而有效地

2.    spider: n. 蜘蛛                          consume: v. 吃

3.    clutch: n. 一群（a clutch of eggs/chickens 一窝蛋/小鸡）

4.    eucalyptus: 桉树

5.    catch: n. 捕获物

6.    fatten: v. 使充实, 使肥胖                 prey: n. 捕获物，猎物

7.    nutrient: n. 营养物

8.    unfertilized:adj. 未受精的               seep:v. 渗出，渗漏

9.    blood stream: n. 血流

10. joint: n. 接合处

11. nourishment:n. 食物, 营养品

12. suck: v. 吸，吮，吸取

13. nutrient-rich: adj. 营养丰富的

14. deplete: v. 耗尽，衰竭

15. Darwin: 达尔文

16. cannibalism:n. 嗜食同类，自相残杀