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
John Dewey thought that children (will learn) (better) through participating in experiences (rather than) through (listening) to lectures.（）

A.will learn
B.better
C.rather than
D.listening
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