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单项选择题
A．About opening a restaurant.B．About working in the laboratory.C．About how to spend the vacation.D．About where to travel.
A．About opening a restaurant.
B．About working in the laboratory.
C．About how to spend the vacation.
D．About where to travel.
单项选择题
A．Disadvantages of tall buildings.B．Modern elevators.C．The Crystal Palace Exhibition.D．The invention of the elevator.
A．Disadvantages of tall buildings.
B．Modern elevators.
C．The Crystal Palace Exhibition.
D．The invention of the elevator.
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