8．There is no doubt that every parent would like to see their kid's ________(grow)．

9．It is not appropriate to wear so ________(casual)on such a formal occasion.

10．It is clearly stated in the book when the tradition came into ________(exist)．

答案：1.disagreement　2.tendency　3.contribution

Ⅲ.阅读理解

　　Polar bears are dying out! They are dying because they are losing a great deal of habitat due to human incursion (侵入) and global warming. They are dying because of starvation as well. With the sea ice they depend on for survival shrinking(缩小)，it is becoming increasingly difficult for them to find food.

　　An ecosystem is highly dependent on all of its parts，and removing even a single species can result in serious consequences.Polar bears are at the top of the predators (捕食性动物) where they live.They play an important part in the ecosystem.They feed on seals，fish and deer.Several other carnivores depend on the kill of polar bears.The failure to save polar bears might result in loss of these predators.

　　In addition, all large predators perform a very important function in their habitat: helping to control the populations of other species.When an animal group loses its natural predators，its population will rise rapidly，having a direct result in population decrease of other groups.A huge boom in population of Arctic seals would have a direct effect on the prey of seals，and could reduce numbers of certain types of fish.

This could also have a direct effect on humans，who might have to