单项选择题

A．Technology development.
B．Cost-cutting.
C．Customers’ appeal.
D．Competition.
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单项选择题
A．Their economic conditions.B．Their ethnic backgrounds.C．Their physical environment.D．Children’s love for playing.
A．Their economic conditions.
B．Their ethnic backgrounds.
C．Their physical environment.
D．Children’s love for playing.
单项选择题
A．25.B．35.C．44.D．62.
A．25.
B．35.
C．44.
D．62.
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