单项选择题

A．Working as a tourist guide.
B．Helping in a restaurant.
C．Working as a shop assistant.
D．Looking after a laboratory.
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单项选择题
A．Steel cables.B．Guide rails.C．An open carriage.D．Strong ropes.
A．Steel cables.
B．Guide rails.
C．An open carriage.
D．Strong ropes.
单项选择题
A．Giving advice.B．Presentation.C．Discussion.D．Independent thinking.
A．Giving advice.
B．Presentation.
C．Discussion.
D．Independent thinking.
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