单项选择题

Questions 18 to 20 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now, listen to the passage.
What does the speaker say about the ocean’s level of saltiness

A．It is measured annually.
B．It is highest at the ocean’s surface.
C．It has increased over time.
D．It has decreased over tim

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单项选择题

单项选择题

Questions 18 to 20 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now, listen to the passage. What does the speaker say about the ocean’s level of saltiness 您的浏览器不支持 audio 元素。