As tempting as it can be to let it all hang loose and stop worrying while on

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问题 As tempting as it can be to let it all hang loose and stop worrying while on vacation, you do want to be aware of your ecological impact. Without a little planning, you may【C1】______ specific environmental and social issues in a given location. You are also inherently reliant on transportation that may be better or worse【C2】______ greenhouse-gas emissions. The synonym for the eco-savvy traveler is【C3】______.
First of all, you should choose ecologically 【C4】______modes of transportation. This means lessening or eliminating your dependence on travel 【C5】______ that result in heavy carbon footprints. Airplanes and cars【C6】______ significant amounts of greenhouse gases to the atmosphere. Walk or bicycle as much as possible—a good method of【C7】______ yourself in your destination. Electric trains and buses are also examples of more efficient and cleaner【C8】______of mechanized travel.
Secondly, investigate the agencies you may choose for your trip to find out their practices and reputations. Ask the company【C9】______what they do for the local community and【C10】______they run their operations. Some may contribute little economically to the area or they may【C11】______engage in ecologically damaging practices,【C12】______fuel-costly tours or excessive harassment of wildlife in the name of sightseeing.
Thirdly, buy locally. This simple practice can have【C13】______ positive implications, both ecologically and economically.【C14】______ of food and other goods from outside the region【C15】______ a lot of energy in the form of transportation and environmental processing.【C16】______ foods that are regionally in-season and locally produced reduces 【C17】______and helps support local farmers and manufacturers.
Finally, tread lightly on the landscape. When visiting a wild area, don’t drive or bicycle off designated routes. If camping,【C18】______ up all garbage or dispose of it in designated receptacles. 【C19】______if dispersed camping is permitted, use preexisting camps【C20】______ possible to lessen erosion. [br] 【C8】

选项 A、plans
B、means
C、paths
D、routes

答案 B

解析名词辨析题。句意为：电力火车和公共汽车也不失为高效、清洁的机械化旅行方式的例子。由前文中的mode，method等词汇，以及各句间的并列关系，可知电力火车和公共汽车也是交通方式，即means“方式”。考虑出行计划已是上文讨论过的内容，故plan不符合本段语境；此处也没有涉及出行的路线和途径等，因此paths和routes也应排除。

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