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.
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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.
A．The early history of bookbinding.
B．How old books become valuable.
C．Economical ways to protect old books.
D．Why some books deteriorate.
单项选择题
A．Ask someone to help the man.B．Give the man the note for his reference.C．Lend the man her pencil and paper.D．Feel sorry that she can’t help the man.
A．Ask someone to help the man.
B．Give the man the note for his reference.
C．Lend the man her pencil and paper.
D．Feel sorry that she can’t help the man.
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