单项选择题

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The message of 1 such as this is 2 natural systems are complex, unpredictable:understanding them 3 patient observation and 4 analysis. The lack of these conditions explains why, in the early modern era, grass snakes were killed as venomous, and gardeners 5 worms because they 6 gnaw plant roots.
The assumption that people "ought" to know about such things is based on an urban-rural divide that opened up in the 18th century. For a 7 of centuries, city and country people did 8 separate realms. But the car, the phone, the media and the Internet have contributed to the 9 tendency of what we call modern lifestyle; and the vast population 10 from cities into rural areas blurred the difference 11 urban and rural. Thus, a new word "rurban" -has been coined to 12 this condition. Most of us now work 13 or in an office, and 14 we are involved in our primary industries, we are 15 more likely to be staring 16 a computer than 17 with the landscape. Human life has turned generally into a 18 by work, sleep, shopping and TV-all 19 identical 20 performed in town or country.

A.at
B.to
C.into
D.with
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