单项选择题

Daylight Saving Time begin at 2

A．m. ______ in the United States every year.A. on the last Sunday of AprilB. on the first Sunday of AprilC. on the last Sunday of MayD. on the first Sunday of May

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单项选择题

Which of the following is TRUE according to the passage

A．Time reverts back to standard time on the first Sunday of October.
B．The United States has used Daylight Saving Time since 1918.
C．The Uniform Time Act requires Daylight Saving Time be observed by all states.
D．Daylight Saving Time was first used in European countries at the beginning of World War

单项选择题

When did Daylight Saving Time become observed nationally

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