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  3. Woodsmen, hunters and trackers learned to follow and read the【21】left, behind【22】animals, men, nature and time. Their ability to

Woodsmen, hunters and trackers learned to follow and read the【21】left, behind【22】animals, men, nature and time. Their ability to

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问题     Woodsmen, hunters and trackers learned to follow and read the【21】left, behind【22】animals, men, nature and time. Their ability to survive【23】on their skills in【24】these signs. Soon they reasoned that if signs left behind accidentally had【25】, they could leave signs deliberately(故意) for their【26】future use or for the benefit of【27】following them.【28】trail signs and symbols【29】and soon became【30】standardized. A hunter in a forest backed(砍) pieces of back(树皮) off some of the trees in his path so that he could find his way back【31】so that others could【32】him. Woodsmen often made a cut on【33】of the tree so that the trail could be seen from【34】direction and from either side of the tree. Trackers chipped from one side only, and then trails were【35】to follow.  
选项 A、both side
B、both sides
C、all sides
D、every side
答案B
解析 本题属词选题。从下文中的“from either side of the tree”和“from one side”即可判断出答案。A项用法错误，正确的应是：both sides。
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