单项选择题

(Some) methods (to prevent) soil erosion(侵蚀) ) (are) plowing parallel with the slopes of hills, (to plant) trees on unproductive land, and rotating crops.

A．Some
B．to prevent
C．are
D．to plant
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单项选择题
(As) every (other) nation, the United States (used to define) (its) unit of currency, the dollar, in terms of the gold standard.
A．As
B．other
C．used to define
D．its
单项选择题
(In England) (as early as) the (twelfth century), young boys enjoyed (to play) football.
A．In England
B．as early as
C．twelfth century
D．to play
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