单项选择题

A．To examine the chemical elements in the Ice Age.
B．To look into the pattern of solar wind activity.
C．To analyze the composition of different trees.
D．To find out the origin of carbon-14 on Earth.
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单项选择题
A．Playing the guitar.B．Working at a restaurant.C．Singing in a rock concert.D．Dancing in a ballet recital.
A．Playing the guitar.
B．Working at a restaurant.
C．Singing in a rock concert.
D．Dancing in a ballet recital.
单项选择题
A．He lost his notes.B．He missed the class.C．He is doing research on alternative fuels.D．He’s studying for a test.
A．He lost his notes.
B．He missed the class.
C．He is doing research on alternative fuels.
D．He’s studying for a test.
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