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．The woman is meeting the man at the airport.B．The man is seeing the woman off.C．They are complaining about the poor airport service.D．They are discussing their plan for Christmas.
A．The woman is meeting the man at the airport.
B．The man is seeing the woman off.
C．They are complaining about the poor airport service.
D．They are discussing their plan for Christmas.
单项选择题
A．The threat of poisonous desert animals and plants.B．The exhaustion of energy resources.C．The destruction of oil wells.D．The spread of the black powder from the fires.
A．The threat of poisonous desert animals and plants.
B．The exhaustion of energy resources.
C．The destruction of oil wells.
D．The spread of the black powder from the fires.
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