5. In order to survive in the winter days, the brown bears depend heavily on the salmon for their .
A) protein
B) drinking
C) fat deposit
D) meat
6. To protect the salmon it gets from being taken by others, a bear usually take the fish into .
A) the forest
B) the river
C) the sea
D) the den
7. Being selective, the bear only eat .
A) the most tender part of salmons
B) the most nourishing part of salmons
C) the most delicious part of salmons
D) the most delightful part of salmons
8. The feeding behavior of the bears can be interpreted as bringing the nutrients from the ocean to the _______________.
9. After the bears finish with their part of the salmon, many other creatures ca benefit from the leftovers ___________________.
10. By supplementing the nutrients needed by the plants ear river side, the bear feeding activities ca have certain influence on the plants ______________.
答案:文章梗概:
本文阐述了棕熊捕食鲑鱼对河边生态的重要作用。首先由人们对棕熊捕食鲑鱼产生的误解引出科学研究的结果棕熊实际上给森林提供了养料。之后介绍了鲑鱼生命周期的特点及其对棕熊的影响。接下来介绍了棕熊捕食行为的两个特点,指出这些行为把海洋养分带给河边生态系统,使很多生物受益。
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