NO.PZ2018053101000035
问题如下：
A characteristic of farmland stronglydistinguishing it from timberland is its:
选项：
A.commodity price-driven returns.
B.inherent rigidity of production for output.
C.value as an offset to other human activities.
解释：
Bis correct. Unlike timberland products, farm products must be harvested whenripe, so there is little flexibility in the production process. In contrast,timber (trees) can be grown and easily “stored” by simply not harvesting. Thisfeature offers the flexibility of harvesting more trees when timber prices areup and delaying harvests when prices are down.
麻烦解释一下，选项A和C什么意思
