In the last paragraph, "what goes around is likely to come around" means that
A. animal predators who go away will come back to prey on humans.
B. different species will be connected in a multidimensional food web.
C. humans" carnivorous eating habit will change back to be herbivorous.
D. the damages humans do to the planet will bring troubles to humans.
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In the second paragraph, "derivatives" most possibly refer to
A. instruments that are used by Wall Street to regulate the market.
B. subprime mortgage-backed securities and insurance policies.
C. profit-making markets with inherent volatility and deficiencies.
D. financial products which potentially can cause chaos.
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.
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.
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