CAMPING Although some groups of people have always lived outdoors in tents, camping as we know it today only began to be

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问题                                 CAMPING
     Although some groups of people have always lived outdoors in tents, camping as we know it today only began to be   (26)______   about 50 years ago. The increase in the use of cars and improvements in camping   (27)______   have allowed more people to travel longer   (28)______   into the countryside and to stay there in greater comfort.
     Many campers like to be   (29)______   themselves in quiet areas, so they   (30)______    their tent and food and walk or cycle into the forests or the mountains. Others, preferring to be near people, drive to a public or privately-owned campsite   (31)______   has up-to-date facilities,   (32)______   hot showers and swimming pools. Whether campers are   (33)______   in the mountains or on a busy site, they should remember to   (34)______   the area clean and tidy. In the forests, they must put out any fires and keep food hidden to avoid attracting   (35)______  animals.

选项 A、on
B、by
C、at
D、of

答案B

解析 本空后面的短语是in quiet areas,表示在安静的地方,因此themselves前面的介词应当是by,表示”独自。单独”。
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