单项选择题

Located in Beijing, the National Library contains an imposing collection of books on every conceivable subject.

A．history
B．catalog
C．shelf
D．array

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单项选择题

I must leave now.______, if you want that book I ll bring it next time.

A．Accidentally
B．Incidentally
C．Eventually
D．Naturally

单项选择题

A．weave
B．dive
C．fade
D．appear

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