单项选择题

Questions 1 to 4 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions.
Now listen to the conversation.
What’s the main subject of this conversation

A．Unites States Canadian agreements.
B．Unlimited growth in population.
C．Pollution in the Great Lakes.
D．The limited supply of phosphates.

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单项选择题

单项选择题

Questions 1 to 4 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions. Now listen to the conversation. What’s the main subject of this conversation 您的浏览器不支持 audio 元素。