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单项选择题

Passage Three

A. Over 8%.
B. Nearly 20%.
C. More than 80%.
D. About 80%.
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单项选择题A. In their properties. B. In their characteristics.C. In their peculiarity. D. In their representative function.

A. In their properties.
B. In their characteristics.
C. In their peculiarity.
D. In their representative function.

单项选择题A．By sending water directly back to the sea with great force. B．By reducing wave energy. C．By reducing beach width. D．By stabilizing beachfront construction.

A．By sending water directly back to the sea with great force.
B．By reducing wave energy.
C．By reducing beach width.
D．By stabilizing beachfront construction.