【单选题】He began working with balloons______.
A．as a relaxation from his work on aircraft
B．as part of his job at the time
C．as a hobby
D．when he heard that some Americans had crossed the Atlantic in one
【单选题】He began working with balloons______.
A．as a relaxation from his work on aircraft
B．as part of his job at the time
C．as a hobby
D．when he heard that some Americans had crossed the Atlantic in one
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