单项选择题

What is the first step of the change

A．Updating engines
B．Buying more trucks
C．Renewing contracts
D．Promoting more sales
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单项选择题
What will the ball’s focus be
A．Dr. Jane Wilder’s work
B．The grand opening of a new wing
C．Science summer camps for children
D．Mr. Donovan’s contributions to conservation
单项选择题
What advice does the speaker give
A．Get home quickly
B．Drive below the speed limit
C．Stay away from buses
D．Don’t commute until 8
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