2. 外语
  3. As every traveler soon finds out, it is important to know the local time.【C1】______until the last century, every town and villag

As every traveler soon finds out, it is important to know the local time.【C1】______until the last century, every town and villag

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问题    As every traveler soon finds out, it is important to know the local time.【C1】______until the last century, every town and village kept its own time, usually regulated【C2】______an official public clock set in the town hall or village church.【C3】______the sun was directly overhead, the clock【C4】______strike noon. This meant that the time was【C5】______for each degree of longitude(经度). Saudi Arabia and a few Pacific islands still keep this "sun time".【C6】______of the world, however, operates according to time zones【C7】______by international agreement. The globe is divided【C8】______24 time zones, one for each hour of the day. Mean time is the time at the Prime Meridian(本初子午线). All the【C9】______zones are measured according to【C10】______time or minus time, reflecting the differences【C11】______the particular time zone and Greenwich mean time. The International Date Line,【C12】______one day changes to the next, is at【C13】______near the 180th meridian.
   The boundaries between time zones are usually meridians.【C14】______on some maps they appear to be straight lines, they are【C15】______great circles. In many places,【C16】______, the time-zone boundaries have been【C17】______to accommodate national boundaries and other political or economic divisions.
    Most nations prefer to have【C18】______of their territory in the same time zone. Those【C19】______very large areas, however, need to【C20】______themselves into two or more zones.  
【C3】
选项 A、When
B、Although
C、If
D、As
答案A
解析 when常用来引导时间状语从句，as也可引导时间状语从句，但通常表示“随着……，一边……一边”，文中句子意思是：“烈日当空的时候，大钟就会敲响，正午时刻到了。”
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