单项选择题
The traditional dividing line in America between "east" and "west" is ______.
A. the Mississippi river
B. the Appalachians
C. the Rocky Mountains
D. the Hudson fiver
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单项选择题
God help those who help themselves is a citation from the work of ______.
A. Paine
B. Franklin
C. Freneau
D. Jefferson
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for改成to。
increased改成increasing。
intend改成tend。
删去介词on。
when改成while。