Suppose a panel of economists predicts that a nation's real GDP per capita will double in approximately 20 years. According to the rule of 70, what must be the predicted annual growth rate of real GDP per capita?
A.
140%
B.
3.5%
C.
2.85%
D.
14%
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【单选题】While steaming slowly in the harbor,no ship is ______ to exceed the speed limited.