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.
When did Daylight Saving Time become observed nationally

A．In 1966.
B．In 1960.
C．In 1948.
D．In 1939.

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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. When did Daylight Saving Time become observed nationally 您的浏览器不支持 audio 元素。