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18.
(A) "It is estimated" that
(B)"approximately" 2.65
(C)"billions" of Christmas cards
(D)"are sold" in the United States each year.

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	4F Dory Chao 國三上 (2013/07/11) *前有「不定數詞」（several, many, a few...）修飾，或完全沒有數詞（1, 2, 3...），而且後面有介詞of時，單位數詞（million, dozen...）本身通常加s，之後再接複數名詞：確切數量：數詞+million+複數名詞 ex. 3 million people (o) 3 millions of people (x) 概略數量：millions of + 複數名詞 ex. millions of people/ many millions of people 檢舉
	5F 音格裡得高二下 (2014/04/24) 筆記 2.65 billion of Chrismas cards/ billions of cards 2 million people/ millions of people 檢舉
	6F Dex Shih 高三上 (2014/04/24) 不清楚是否可以寫2.65 billion of Chrismas cards? 網路寫的是2.65 billion Chrismas cards。 of 前面要加s，如 Approximately 600 billion cups of coffee are consumed every year globally. 檢舉

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