单项选择题

Questions 7 to 10 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 are speakers mainly discussing

A．The effect of the atmosphere on rainfall.
B．How conditions on Earth support life.
C．How water originated on Earth.
D．A new estimate of the age of Earth.

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单项选择题

According to the speaker, what were the beliefs of the Greek philosophers based upon

A．How the natural world was described in Greek mythology.
B．What they observed directly.
C．The writings of philosophers from other societies.
D．Measurements made with scientific instruments.

单项选择题

When was the first actual radio broadcast made

A．On Christmas Eve of 1906.
B．On Christmas Eve of 1960.
C．On Christmas Eve of 1895.
D．On Christmas Eve of 1859.

Questions 7 to 10 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 are speakers mainly discussing 您的浏览器不支持 audio 元素。

Questions 7 to 10 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 are speakers mainly discussing