单项选择题

A．5.
B．3.
C．2.
D．8.
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单项选择题
A．To attend a conference.B．To see the planetarium.C．To change planes.D．To go sightseeing.
A．To attend a conference.
B．To see the planetarium.
C．To change planes.
D．To go sightseeing.
问答题
S1. Thus, with one class possessing the requisite knowledge and experience, but lacking incentive and leisure, and the other class lacking the knowledge and experience, there was no means by which technical progress could be achieved.
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