The author implies in the tenth paragraph that
Americans can"t wag their fingers because carnivorous diet is unhealthy for the bones.
B. Americans don"t have the right to criticize other nations" unhealthy eating habit.
C. Americans should account for the largest portion of green house gas emission.
D. Americans prefer to eat meat because they believe that meat has more nutrition.
查看答案
Which description is CORRECT about the trophic numbers of different species？
A. Tigers are at level 5 because they prey on apes.
B. Herbivores are level-2 animals that feed on plants.
C. The actual trophic score of foxes might be almost 4.
D. Insectivores eat multicellular plants and occupy level 2.
If our global population becomes more carnivorous, humans will face all the following threats EXCEPT that
A. large acres of woods will be cut down.
B. the number of livestock will decrease.
C. enormous resources will be consumed.
D. more green house gases will be emitted.
Nowadays, biologists tend to believe that humans
A. occupy the top of the food chain.
B. inhabit the same level as anchovies.
C. rank above autotrophs and herbivores.
D. move up to the trophic level of pigs.
Greater London is NOT______of the United Kingdom.
A. the administrative center
B. the most important port
C. the financial center
D. the transportation center
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