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NO.216
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题目来源 : 填空经典1500题
Select the two answer choices that, when used to complete the sentence, fit the meaning of the sentence as a whole and produce completed sentences that are alike in meaning.

The juxtaposition of fertile alluvial soils originating in the Andes with the infertile inland soils of central Amazon Basin is one example of _____ of the soil conditions that can be found in the tropics. 

intractability
heterogeneity
incompatibility
disparateness
instability
fragility

Select two answer choices.

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