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【单选题】
当代心理学家布朗芬?布兰纳关于儿童发展的“生态系统学理论”认为，（ ）对于儿童发展的影响是直接的、强烈的和持久的，它的责任与影响力是不可取代的。
A.
学校
B.
环境
C.
家庭
D.
社会
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举一反三
【单选题】生态系统的能量流动是指（）
A.
太阳能被绿色植物固定的过程
B.
生态系统内生物体能量代谢的过程
C.
生态系统内伴随物质循环的能量转移过程
D.
能量从生物体进入环境的过程
【单选题】Lead deposits, which accumulated in soil and snow during the 1960’s and 1970’s, were primarily the result of leaded gasoline emissions originating in the United States. In the twenty years that the Cl...
A.
forests get rid of lead pollution faster than expected
B.
lead accumulations in forests are more difficult to deal with
C.
lead deposits are widely distributed in the forests of the US
D.
the upper layers of soil in forests are easily polluted by lead emissions
相关题目：
【单选题】生态系统的能量流动是指（）
A.
太阳能被绿色植物固定的过程
B.
生态系统内生物体能量代谢的过程
C.
生态系统内伴随物质循环的能量转移过程
D.
能量从生物体进入环境的过程
【单选题】Lead deposits, which accumulated in soil and snow during the 1960’s and 1970’s, were primarily the result of leaded gasoline emissions originating in the United States. In the twenty years that the Cl...
A.
forests get rid of lead pollution faster than expected
B.
lead accumulations in forests are more difficult to deal with
C.
lead deposits are widely distributed in the forests of the US
D.
the upper layers of soil in forests are easily polluted by lead emissions
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