单项选择题
What qualities made the Silicon Valley impossible to clone?（）
A.Strong universities and a risk-taking culture
B.Rich natural resource
C.Residental circumstance and pleasant climate
D.Reveloped economy
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相关考题
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单项选择题
（）has the 19th-largest economy in the world.
A.Shanghai
B.Switzerland
C.Saudi Arabia
D.The Bay Area -
单项选择题
What’s the meaning of “wax and wane” ?（）
A.月圆
B.兴衰成败
C.月缺
D.退潮 -
判断题
When we land how can we get our stroller back?译文：等我们下机后, 我们怎样取回婴儿车呢?
