单项选择题

Passage One Questions 11 to 13 are based on the passage you have just heard.

A．It was decreasing.
B．It was increasing.
C．It remains almost unchanged.
D．It was going up slowly.

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单项选择题

单项选择题

Passage One Questions 11 to 13 are based on the passage you have just heard. 您的浏览器不支持 audio 元素。