单项选择题

A．Call on people to protect sharks.
B．Point out the living environment of sharks.
C．Explain why the sharks are dangerous.
D．An introduction to sharks.
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单项选择题
A．The book has been sold.B．The book has been lost.C．The book has been reserved.D．The book has been borrowed by the professor.
A．The book has been sold.
B．The book has been lost.
C．The book has been reserved.
D．The book has been borrowed by the professor.
填空题
empties
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