According to the passage, why did the government pass the Timber Culture Act of 1873 ?
A.To make larger tracts of land available to small farmers
B.To settle Kansas, Nebraska, and the Dakotas
C.To encourage land speculation west of the Mississippi
D.To increase the variety of trees growing in the western states
第3题
酪氨酸在体内不能转变生成的是
A.肾上腺素 B.黑色素
C.延胡索酸 D.苯丙氨酸
E.乙酰乙酸
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