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．They have stopped carrying out any activities.B．They went to sleep early.C．They have gone to the swimming pool.D．They have kept quiet.
A．They have stopped carrying out any activities.
B．They went to sleep early.
C．They have gone to the swimming pool.
D．They have kept quiet.
单项选择题
A．Wear a new dress.B．Attend a party.C．Go shopping.D．Make a silk dress.
A．Wear a new dress.
B．Attend a party.
C．Go shopping.
D．Make a silk dress.
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