这是南开中学3月考题。
概要补全。(84和86小题，每小题2分；85和87小题，每小题3分，共10分）阅读文章，用恰当的短语或句子补全概要。补全部分总词数不超过30词。不能照抄原文连续超过3个词。
"Is Antarctica （南极洲） one of your vacation places?"
I travelled to the earth's southernmost place by ship this winter vacation. The trip, however, turned out to be a great lesson about the Antarctic environment. On my way back, I couldn't help asking myself, " How have I affected the Antarctic environment? Should I have even travelled to the continent?" Most travel comes with an environmental cost. Our guide told us that carbon(碳) footprints are left as the ships produce lots of greenhouse gases. In addition, the noise of ships passing through the ocean can cause serious harm to sea life.
When we travel from one place to another, seeds as well as bacteria（细菌）are spread. For Antarctica, it can be damaging. Tour operators try to prevent this problem by providing travelers with special boots（靴). Travelers must wear them whenever they leave their ships. Their outerwear must also be cleaned before it can be worn for landing. However, when they get hot while hiking, travelers may take off-their outerwear and the-other clothes they wear are not usually required to be cleaned.
The increase in tourism in Antarctica may also bring about some unknown risks. For example, since there is no native human population in Antarctica, the local animals are not used to sharing their homes with us. We may not be able to notice any problems now, but when we begin to see changes, it may already be too late.
It was truly wonderful to see the beauty of Antarctica with my own eyes. However, my trip did harm the Antarctic environment and wildlife. Before you decide to land on the continent, ask yourself, "What risk am I taking to this peaceful place? Is it really worth visiting?"
Antarctica is on many people's travel lists. However 84 comes with a high environmental cost. 85 by producing greenhouse gases and noise. Also, traveliers can bring in non-native seeds and bacteria through 86 . To cut down both known and unknown risks， 87 .
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