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.
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单项选择题
A．The chairperson elected by the members of the committee.B．One of the representatives who are in charge of the great graduation ceremony.C．The chairperson elected by the representatives of different departments,D．The person who is in charge of organizing the graduation ceremony every year.
A．The chairperson elected by the members of the committee.
B．One of the representatives who are in charge of the great graduation ceremony.
C．The chairperson elected by the representatives of different departments,
D．The person who is in charge of organizing the graduation ceremony every year.
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