单项选择题

A．Find some drift wood.
B．Take some photographs.
C．Solve a mystery.
D．See the canyon.
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单项选择题
A．To avoid hostile Indians.B．To avoid the strong sunlight.C．To avoid the rain.D．To avoid wild animals.
A．To avoid hostile Indians.
B．To avoid the strong sunlight.
C．To avoid the rain.
D．To avoid wild animals.
单项选择题
A．From rocks in the mountain.B．From the remains of ancient sea life.C．From the soil under the sea.D．From ancient trees.
A．From rocks in the mountain.
B．From the remains of ancient sea life.
C．From the soil under the sea.
D．From ancient trees.
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