单项选择题

The vast ______ area of this country enabled us to welcome the hordes of immigrants that flocked to our shores.

A．teeming
B．explored
C．flourishing
D．undeveloped
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单项选择题
The seminar, ______ by the Nobel Prize winner, probes the problem of wildlife extinction in African countries.
A．convened
B．acquainted
C．incurred
D．hauled
单项选择题
My mother tried to ______ a little money each month for his summer ruction.
A．put forward
B．set aside
C．bring about
D．make for
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