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.
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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.
单项选择题
A．They thought it quite acceptable.B．They believed it to be a luxury.C．They took it to be a trend.D．They considered it avoidable.
A．They thought it quite acceptable.
B．They believed it to be a luxury.
C．They took it to be a trend.
D．They considered it avoidable.
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