单项选择题

A．concatenation
B．continuity
C．agreement
D．progression
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单项选择题
A．FurthermoreB．MoreoverC．HoweverD．To begin with
A．Furthermore
B．Moreover
C．However
D．To begin with
单项选择题
How does a Maglev operate
A．It uses nuclear energy.
B．It rests on a cushion of pressurized air.
C．It flies over magnetically activated tracks.
D．It uses a device similar to a jet engine.
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