问题：
[单选题]一般来说，战略群体的差异主要表现为生产经营活动的重点不同。具体来说，主要包括专业化程度不同、研究开发程度不同、推销重点不同以及（ ）。
A、横向一体化程度不同
B、相关多元化程度不同
C、纵向一体化程度不同
D、不相关多元化程度不同
参考答案：
C
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- ● （）any cae or upected cae of quarantinable dieae，or any cae of eruptive dieae or any death be dicovered，the local quarantine officer mut be notified immediately．
- ● Should any cae or upected cae of quarantinable dieae，or any cae of eruptive dieae or any death be dicovered，the local Quarantine Officer mut be（）immediately.
- ● Damage to cargo caued by fume or vapor from liquid,gae, or olid i known a（）.
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- ● If he i a common carrier，he i abolutely reponible to the owner of the good carried （）any lo or damage to them unle caued by an Act of God or the Queen’ enemie，or the inherent vice in the good themelve，or the negligence of the owner of the good，or a general average acrifice.
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- ● The carrier i liable for lo of or damage to the good or delay in delivery caued by fire，（）the claimant prove that the fire aroe from fault or neglect on the part of the carrier，hi ervant or agent.
- ● Shutdown price（or point，or rule） 停业价格（或停业点、停业原则）
