oceans, since oceans provide habitats for many different kinds of species
freshwater bodies, since such effects become pronounced in relatively small spaces
freshwater lakes, since nutrients in freshwater lakes are present only in small amounts
land areas, since there exist major influences of climate on the kinds of small organisms supported in land areas
27. The primary topic of the passage is the way in which
organisms are affected by the amount of nutrients available
organisms can change their own surroundings
elements of freshwater habitats impede the growth of small organisms
the reproduction of organisms is controlled by factors in the environment
plant matter in a given locale can increase up to a limit
答案:17-27:ADCEBABDECB
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