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Gaokao Biology Practice Question

在我国西北某地区，有将荒漠成功改造为枸杞园的事例。改造成的枸杞园与荒漠相比，生态系统的格局发生了重大变化。下列叙述错误的是（ ）

  1. A.防风固沙能力有所显现
  2. B.食物链和食物网基本不变
  3. C.土壤的水、肥条件得到很大改善
  4. D.单位空间内被生产者固定的太阳能明显增多

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