单项选择题

The experience of foreign countries is worth learning from and taking for reference.（）

A．learning and reference.
B．our learning and our reference
C．our learning from and taking for reference
D．our learning and make reference to

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单项选择题

The border was actually two towns, though no one was big enough to amount to anything.（）

A．not one
B．neither one
C．none
D．nor

单项选择题

There are actually too many opportunities to learn more, to see more, and to understand more, and they all require us to change, at least a little bit, in order to make progress.（）

A．very many
B．too much
C．so many
D．extremely many

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