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【简答题】
读图，完成下列问题。 （1）土壤中的有机质包括遗留在土壤中的生物残体如图中的________以及经过微生物的生化作用形成的 _______。 （2）生物在土壤形成过程中的主导作用表现为________________________________________________。 具体体现是①___________________________________，②___________________________________。
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【单选题】Which of the following countries is the locality of the R. E.R. system?
A.
England.
B.
the United States.
C.
Germany.
D.
France.
【简答题】Questions 36 to 40 are based on the following. In the early days of nuclear power, the United States made money on it. But today opponents have so complicated its development that no nuclear plants ha...
【单选题】Which of the following 'Big Three' radio and television networks in the United States is also called the 'Peacock Network'?
A.
NBC
B.
CBS
C.
ABC
D.
HBO
【单选题】Which of the following can be inferred from the passage about cotton production in the United States after the introduction of Whitney's cotton gin?
A.
More cotton came from sea island cotton plants than before.
B.
More cotton came from short-staple cotton plants than before.
C.
Most cotton produced was sold domestically.
D.
Most cotton produced was exported to England.
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