2. 外语
  3. Due to the region’s low levels of rainfall, Arizona maintains the lowest______of plant and animal life in the country.

Due to the region’s low levels of rainfall, Arizona maintains the lowest______of plant and animal life in the country.

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问题 Due to the region’s low levels of rainfall, Arizona maintains the lowest______of plant and animal life in the country.
选项 A、affiliation
B、concentration
C、alteration
D、formation
答案B
解析 依据上下文语义，此处意为“由于降雨量低而维持着最低的动植物密度”，可知名词(B)concentration(密集)为正确答案。(A)affiliation意为“加入，所属”，(C)alteration意为“变化：改造”，(D)formation意为“形成”。
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