请教两道初中英语词性转换的题目

Question

1、Our world is in danger. The greenhouse effect may cause the level ofthe sea to rise and flood cities and even the whole ______________. (country)
是country还是countries，为什么？
2、Tom has great ___________ incollecting stamps and travelling around the world. (interesting)
是interest还是interests，为什么？

Answer 1

1、Our world is in danger. The greenhouse effect may cause the level ofthe sea to rise and flood cities and even the whole ______________. (country)
是country还是countries，为什么？
选country。因为the whole country是【一个完整的国家】，意思是：“整个国家/全国”
2、Tom has great ___________ in collecting stamps and travelling around the world. (interesting)
是interest还是interests，为什么？
选interest。因为have interest in collecting stamps and travelling around the world是【兴趣爱好】的固定短语。

Answer 2

countries 因为这句话可以从这里flood cities and even the whole ______________.得出，flood这里是动词 淹没城市 甚至整个国家。city城市复数形式，表示并列 country国家也用复数形式

第二题 interest
固定短语 have interest in 在。。感兴趣

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Answer 3

Country. 前面淹没城市，一个国家有很多城市， 因此是复数。但后面，甚至淹没，这整个国家，单数形式。

have interest in  固定词组搭配  interest 不可数名词