单项选择题

A．miles
B．mile
C．mile’s
D．miles’
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单项选择题
A．byB．onC．atD．to
A．by
B．on
C．at
D．to
单项选择题
What was the attitude in the 19th century toward resources of the sea
A．Declined.
B．Depleted.
C．Limited.
D．Unlimited.
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