正确答案: B

氮、磷的循环周期

题目：营养物质循环的研究阶段不包括( )

解析：B

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举一反三的答案和解析：

[单选题]What does the passage tell us about women shoppers for clothes?

They welcome suggestions from anyone.

解析：

    45．答案为A  此考题为细节题。根据第4段第5句She is always open to what the salesman tells her，even to what her friends tell her，我们便可知A上确。

[单选题]Paula: Seems colder today,_________ ?Peter: It is colder. It was on the weather forecast.

or is it just for me

解析：从A、B、C、D四个选项中我们可知，空白处想要表达的大致意思是：“只有我感觉到了吗?”A项的表达不正确；C项和D项的表达太中式化；所以只有B项的表达是最符合题意的。