A) Because the hungry bears would hurt many people.
B) Because the hungry bears were on the verge of extinction.
C) Because the hungry bears would cause disasters to salmon, thus affecting social economy.
D) Because the hungry bears would attack the poultry in Alaska.
2. What is the researchers finding of bears to the forest?
A) Bears have done great harm to the forest by littering their half eaten salmons.
B) Bears have destroyed the environment by destroying the forest.
C) Bears have actually left many salmons to the forest.
D) Bears have actually provided nutrients to the forest by littering their half eaten salmons.
3. Young salmons live in .
A) the fresh water
B) the sea
C) the gravel on the ground
D) the pond
4. Why does the influx of energy from the ocean have great effect on freshwater systems?
A) Because the salmons have brought back a large number of other fishes.
B) Because most young salmons die at sea and they produce much nutrition.
C) Because the nutrient composition of the fish and their densities are so great.
D) Because death of adult salmons at sea produces a large number of nutrients.
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