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．Because they have a driving license.B．Because they have received special training.C．Because the traffic condition in London are good.D．Because the traffic system of the city is not very complex.
A．Because they have a driving license.
B．Because they have received special training.
C．Because the traffic condition in London are good.
D．Because the traffic system of the city is not very complex.
单项选择题
A．The professor’s presentation was not convincing enough.B．The professor’s lecture notes were too complicated.C．The professor spoke with a strong accent.D．The professor spoke too fast.
A．The professor’s presentation was not convincing enough.
B．The professor’s lecture notes were too complicated.
C．The professor spoke with a strong accent.
D．The professor spoke too fast.
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