单项选择题

A．11:45.
B．12:00.
C．1:15.
D．12:45.
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单项选择题
A．The silk covering made by an insect.B．The silk covering made by a silkworm.C．The soft protective covering made by an animal.D．The hard protective covering made by an animal.
A．The silk covering made by an insect.
B．The silk covering made by a silkworm.
C．The soft protective covering made by an animal.
D．The hard protective covering made by an animal.
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