单项选择题


Questions 29 to 31 are based on the passage you have just heard.

A．They have great power.
B．They have very diversified responsibilities.
C．They are very modern and efficient.
D．They are so smart.
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environmental
单项选择题
A．When the white settlers began to move west in 1812.B．When the increasing white settlers began to kill wild animals.C．When many Indians began to die from the diseases.D．When the white settlers wanted to occupy the land.
A．When the white settlers began to move west in 1812.
B．When the increasing white settlers began to kill wild animals.
C．When many Indians began to die from the diseases.
D．When the white settlers wanted to occupy the land.
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