单项选择题

A．The early history of bookbinding.
B．How old books become valuable.
C．Economical ways to protect old books.
D．Why some books deteriorate.
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单项选择题
A．How hydrothermal vents are formed.B．How living things get energy from sunlight.C．The harmful effects of certain chemicals in the ocean.D．Microorganisms that get energy from chemical reactions.
A．How hydrothermal vents are formed.
B．How living things get energy from sunlight.
C．The harmful effects of certain chemicals in the ocean.
D．Microorganisms that get energy from chemical reactions.
单项选择题
A．At the end of November.B．In the middle of November.C．At the beginning of December.D．In the middle of December..
A．At the end of November.
B．In the middle of November.
C．At the beginning of December.
D．In the middle of December..
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