【題目】We went to ________ earth. ( )

A.an

B.a

C.the

【答案】C

【解析】

a/an是不定冠詞，用在可數(shù)名詞的單數(shù)形式前表示泛指—表明一類人或事物區(qū)別于它類。 例：I am a Chinese. 我是(一個(gè))中國(guó)人。 This is a book. 這是（一本）書。在以元音音素開頭的可數(shù)名詞的單數(shù)名詞前用an而不用a。當(dāng)我們使用an時(shí)，條件有三：①這個(gè)名詞的讀音必須是以元音音素開頭—即它的，音標(biāo)的第一個(gè)音素是元音，而不是說(shuō)它是以元音字母開頭。②它必須是個(gè)可數(shù)名詞。③它還必須是個(gè)單數(shù)名詞。我們常常見(jiàn)到這類用法：a university 一所大學(xué) an hour 一個(gè)小時(shí)，an orange 一只桔子 an engineer 一位工程師。the是定冠詞，the用在世界上獨(dú)一無(wú)二的名詞前，這類詞有：the sun太陽(yáng)，the earth地球，the moon月亮，the sky天空，the world 世界，例：The moon goes round the earth. 月亮繞著地球轉(zhuǎn)。There is not any cloud in the sky. 天空中沒(méi)有一絲云彩。故選C。

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