单项选择题

Tile Chinese government plans to buy at least ______ new models of Boeing’s 737 aircraft.

A．thirty
B．thirteen
C．sixteen
D．fifty
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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.
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 WarI.
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