单项选择题

A．The industrialization of the United States.
B．The development of individual timepieces.
C．Reasons for increased productivity.
D．How wristwatches are manufactured.
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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.
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.
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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