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Questions 18-20 are based on a monologue about an Australian city of Perth. You now have 15 seconds to read Questions 18-20.
Why did Perth develop very slowly at the beginning according to the introduction

A．It was occupied by Britain.
B．It was a wetland.
C．It scarcely contacted the other cities.
D．It had no rich natural resources.

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单项选择题

Questions 18-20 are based on a monologue about an Australian city of Perth. You now have 15 seconds to read Questions 18-20. Why did Perth develop very slowly at the beginning according to the introduction 您的浏览器不支持 audio 元素。