科研之友
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<正>We were almost there! I saw the flag for the na-tional park waving in the summer wind. In just afew minutes we’d be exploring the rim(边缘) of themagnificent Grand Canyon. Mom made sure we hada snack before leaving the car. She had brought aloaf of banana bread and a bottle of orange juice.After our snack we walked across the bridgeover a stream. We noticed a school of tiny fish in
