填空题

When was the helicopter made

【参考答案】

The helicopter was made in 1940.
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How can that helicopter work
单项选择题
A．Caller and operator.B．Salesman and customer.C．Airline agent and customer.D．stewardess and passenger.
A．Caller and operator.
B．Salesman and customer.
C．Airline agent and customer.
D．stewardess and passenger.
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