2. 外语
  3. From the very beginning, water has furnished man with a source of food and a highway to travel. The first civilizations arose 【2

From the very beginning, water has furnished man with a source of food and a highway to travel. The first civilizations arose 【2

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问题      From the very beginning, water has furnished man with a source of food and a highway to travel. The first civilizations arose 【21】______  water was a dominant element in the environments, a challenge 【22】______  man’s ingenuity. The Egyptians invented the 3655-day calendar  (23   the Nile’s annual flooding. The Babylonians, 【24】______  were among the most famous law-makers in ancient times, invented laws 【25】______  water usage. Water inspired the Chinese to build a 1000 【26】______  canal, a complex system 【27】______  , after 2500 years, remains practically 【28】______  and still commands the astonishment of engineers. But 【29】______  never found complete solutions 【30】______  their water problem. The Yellow River is also known 【31】______  "China’s Sorrow". It is so unpredictable and dangerous 【32】______  in a single flood it has caused a million 【33】______ . Floods slowed the great 【34】______  of the Indus River Valleys, and innumerable damage mined 【35】______  of its land. Today, water dominates man 【36】______  it always has done. Its presence continues to 【37】______  the location of his homes and cities; its violent variability can 【38】______  man or his herds or his crops; its routes links him 【39】______  his fellows; its immense value may 【40】______  to already dangerous political conflicts. There are many examples of this in our own time.
【27】
选项 A、who
B、in which
C、which
D、by which
答案C
解析 此句是由which引导定语从句，修饰canal的同位语a complex system。
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