单项选择题

At least six times since the end of the last ice age, the Mississippi River has dramatically altered its _____.

A．course
B．road
C．way
D．channel
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单项选择题
There will be a series of _____ on the British legal system in our department.
A．speeches
B．classes
C．address
D．lectures
单项选择题
Please write your name in the _____ space at the top of the form and then hand it back to me.
A．empty
B．bare
C．blank
D．hollow
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