I'll give you a question, please answer with step-by-step reasoning process. You should watch out for snakes if floating down what African body of water?\nOptions:\n- wet grass\n- western texas\n- high grass\n- amazon river\n- tree

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River can be called as a body of water. You should watch the snakes that are floating down in amazon river which is an African body if water.
The answer: amazon river.
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