4．C　解析：标题判断题。通读全文的内容可知，文章围绕的是“应该不应该去南极洲旅游？”这一话题，因此C项最适合作标题。

　　Ⅱ.完形填空

　　(2015·江西南昌市高三调研)I felt very depressed the other day.The weather had been dark and rainy，and I just didn't feel so __1__.

　　As I was sitting at my desk，I__2__it was the birthday of a dear long­time friend—a single，middle­aged woman who has devoted the past 30 years to nursing and loving her __3__.

　　Knowing that she didn't have family in town，I __4__ to give her a call.Sure enough，she was on her shift，__5__ to work late into the evening，and wouldn't have __6__ of a birthday this year.As always，though，she __7__ cheerful and was happy that I __8__.

　　After I hung up，I couldn't __9__ the feeling that she would really appreciate a little attention on her special day.__10__feeling a little depressed myself，I tried to put it out of my mind，but as the day passed，I couldn't shake the thought.I __11__gave in，and set off to the hospital with a card，a cheese cake，and some balloons that evening.My friend's grateful smile and joyful surprise __12__me that I'd done the right thing，and they were a generous__13__ for the little effort it had taken.

　　When I got home，I realized that not only had I cheered up a __14__ friend on her birthday，but my own negative feelings　had also disappeared.Making her day had__15__my own！Isn't that the way it is __16__we take the time and make the __17__ to do something for someone else? It's just like the saying，“Loving kindness is twice blessed；it blesses him who gives，and him who __18__.”

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