D. Observe signs to approach nesting birds.

　　答案与解析　C　考查细节理解。根据文中Keep to the track部分中的内容可知，游客要沿着路径行走，减小破坏脆弱的植物的几率，因此选择C。

　　三、完形填空

　　(2016·东北三校联考)

　　It was Easter 1990, and my family was on a once­in­a­lifetime trip to the Solomon Islands for my sister's wedding.

　　I was traveling with my husband, my four­year­old son and my daughter, who was nearly two. We'd been __1__ it was very hot in the Solomon Islands, so we'd __2__ lots of light cotton clothes and were wearing the same as it was summer. The only problem was that we had to catch an overnight bus that __3__ at midnight for the airport so we could make our early morning __4__ to Honiara. It was cold on the bus! My husband and I were snuggling (使依偎) our children as best we could, trying to keep them __5__. The bus stopped many times as passengers got on and off, and we didn't take much __6__. The little ones were __7__， unable to sleep for the biting cold. Then at one stop, an older lady came forward from the back of the bus and paused by our seat. I sat forward to see what she wanted and she __8__ out a small knee rug (毛毯). My little girl reached __9__ for it and pulled it tight __10__ her. The lady said she'd made the rug herself and seeing that we were cold, she wanted us to use it. After she went back to her seat, our now­warm children __11__ off, and they slept snugly all the way to the airport. Just a stop or two __12__ we arrived, the rug lady made her way to the door to get off. I tried to __13__ the children to return her blanket, but she protested. “No，” she said, “__14__ it. I can always make another one！”

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