单项选择题

Passage One Questions 26 to 28 are based on the passage you have just heard.

A．The discovery of oil
B．The interest in wildlife.
C．An increase in the birthrate.
D．An improvement in building materials.
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单项选择题
A．A very popular food plant:B．A plant with limited uses.C．A food plant which has been thoroughly used.D．A plant used as a main food on the Pacific Islands.
A．A very popular food plant:
B．A plant with limited uses.
C．A food plant which has been thoroughly used.
D．A plant used as a main food on the Pacific Islands.
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