单项选择题

According to the way the machine operated, the felling machine can be classified into ______.
A.three-wheel machine vs. four-wheel machine
B.drive to tree machine vs. swing to tree machine
C.saw-head machine vs. shear-head machine

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The first step in harvesting a timber is ______. A.Delimbing B.Felling C.Bucking
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Timber harvesting is the end of ______ of a forest in terms of timber production, and also the start of ______. A.timber production, forest management B.next generation, growing cycle C.growing cycle, next generation
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