3.31托福综合写作机经

71. Birdfeeder’s negative impact 1. It encourage birds to stay together and transmit diseases. For example, the red eye disease among flinch. 2. Birds are easily be harmed by predators like cats, and they may bump on the windows. 3. It affects their migrating behaviors as they will not move to the warm places if there are enough food, and thus influence their mating productivity.

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