正确答案: A

利比希最小因子定律

题目：农田作物的生长和土壤养分之间有着密切的关系，其产量往往受土壤中供应最不足的营养元素所制约。这是( )

解析：A

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举一反三的答案和解析：

[单选题]Passage ThreeAn old Indian story says that the game of chess (国际象棋) was invented by Sissa Ben, Prime Minister of King Shirham. As soon as the invention was finished he gave it to the king, who was glad and asked him what he would like to have in return. To the king's surprise, what Sissa wanted seemed very little. "Your Majesty, "said the minister, kneeling before the king. "I want nothing but some wheat. Please put a grain of wheat on the first square of the chessboard (棋盘), two on the second, four on the third, eight on the fourth.., and so on, doubling the number for each following square. Give me enough grains to cover the 64 squares of the chessboard."

how clever the minister was

解析：此题是对主题思想进行综合判断和概括的考查。其中关键词为story tells。 主题概括题是集评价、总结为一体。要求考生在理解原文的基础上做出切题的概括、总结和评价。解题时不要过于具体或过于笼统。善于从主题段或主题句中发现中 心思想和通过关键词语把握作者意图。亦可在完成其他具体解题后，对文章全貌有了大概了解的基础上再处理此题。通过阅读全文我们知道那个宰相的要求看似简单(第1段第3句very little，第2段第1句You don't ask for much)，却使国王负债于他(第3段第2句the number increased．．，king．．．not．．．keep promise，最后一段第 1句the king．．．in debt)。故可判断他是何等的聪明。所以B项是正确答案。

[单选题]冲动传到突触前膜轴突末梢，引起膜对哪种离子通透性增加 （ ）

Ca2+

[单选题]教学工作的中心环节是

上课

[单选题]The writer thinks that we can't judge ______.

all the modern buildings by the ancient standards

解析：

54．答案为C。根据第二段第一句，We can't judge every modern building by the standards of the ancient time，even though we admire the ancient buildings作出该项选择。

[单选题]下面不成对的颅骨是 （ ）

下颌骨

[单选题]突触前抑制的发生是由于 （ ）

突触前膜兴奋性递质释放量减少

[单选题]None of the managers said that,______?

did they

解析：

12．答案为B  没有一个经理那样说，不是吗?none本身有否定意味，反意疑问句用肯定形式。

[单选题]唯物主义的古代形态是（ ）

朴素唯物主义

[单选题]颈内动脉( )

营养脑和视器