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单项选择题

A．To find out the origin of carbon- 14 on Earth.
B．To analyze the composition of different trees.
C．To look into the pattern of solar wind activity.
D．To examine the chemical elements in the Ice Age.
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热门试题

单项选择题A．In a house.B．In a hotel.C．In a two-bedroom apartment.D．In a three-bedroom apartment.

A．In a house.
B．In a hotel.
C．In a two-bedroom apartment.
D．In a three-bedroom apartment.

单项选择题A．Rome.B．London.C．Venice.D．Paris.

A．Rome.
B．London.
C．Venice.
D．Paris.