单选题：（　）Copernicus developed his theory __________.

题目分类：英语
题目类型：单选题
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题目内容：

（　）Copernicus developed his theory __________. A．using various telescopes
B．based on Aristotle's beliefs
C．through observations and reasoning
D．under the encouragement of his friends

参考答案：

答案解析：

在迈克尔•波特的五种竞争力量分析中，潜在进入者的威胁程度取决于进入障碍和行业内原有企业的反击程度。就进入障碍而言，决定进

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