根据下列文章，回答 51～55 题。 第 51 题 The main idea of this passage is to

根据下列文章，回答 51～55 题。

第 51 题 This passage is mainly about_____

根据下列文章，请回答 51～55 题。

第 51 题 This passage could be entitled_____

根据下列文章，回答 51～55 题。

第 51 题 What was the underlying significance of the invention of the Kodak？

根据下列文章，请回答 51～55 题。

第 51 题 Now a nation’s political influence depends on____．

根据下列文章，回答 51～55 题。

第 51 题 Why was Kohoutek referred to as“the comet of the century”？

根据下列文章，回答 51～55 题。

第 51 题 Compared with other students，the most different thing Rowena and Billy do is that_____

根据下列阅读材料，回答 51～55 题：

第 51 题 The author says that old family firms __________.

阅读下列短文，回答 51～55 题：

第 51 题 It cannot be inferred from the first paragraph that _______.

阅读下列短文，回答 51～55 题：{Page}

第 51 题 what is the main idea of this passage？