单项选择题
If you husband something valuable, you use it （）。
A.Carelessly
B.Optionally
C.Carefully
D.Freely
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Many startups in Silicon Valley are branching out into new places that the trend has a name, Off Silicon Valleying. -
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What qualities made the Silicon Valley impossible to clone?（）
A.Strong universities and a risk-taking culture
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（）has the 19th-largest economy in the world.
A.Shanghai
B.Switzerland
C.Saudi Arabia
D.The Bay Area
