4．A　解析：文章出处题。根据文章的整体内容可推知，本文主要研究的是气候变暖对北极圈植物的影响，故该文应选自科研报告，即A项正确。

　　Ⅳ.完形填空

　　(2015·河南南阳质检)Almost every woman wants to be a good mother，but there are a lot of unexpected difficulties in the process. You want your children to be educated in all areas of life so that they know __1__ about the world. You never stop worrying if you are doing a good job as a(n) __2__.I always took my daughter to museums and theaters at a(n) __3__ age. I thought she would learn more about the __4__ around her. I wanted to teach her all I could. I __5__ her to be a smart，kind and lovely girl.

　　One day I took her to the Natural History Museum. This was her first __6__ to a museum. I hoped she would have __7__ and learn new things. When we walked into the area where the whale hung，my daughter __8__ at me，“Mom，why does that man over there keep __9__？“I __10__ my head and saw a disabled man with problems with his back and legs __11__ to walk. I was so __12__ that I knew I had to answer her __13__ she yelled again. I was hoping he did not __14__ her. I simply replied，“ He loves to dance，because it just makes him feel __15__.“He did hear us and headed toward her. I was lost for words. I was going to __16__ to him for my daughter's words. He approached us and I saw a __17__ on his face. He said happily that that was the nicest thing anyone had ever said about him as people always __18__ him because of his problems. He turned to my daughter and said，“Yes，little angel，I love to dance. It makes me happy.”

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