You’d better go there by train. The train ticket is _____ the airplane ticket.
A．a(chǎn)s cheap three times asB．a(chǎn)s three times cheap as
C．three times cheaper thanD．three times as cheaper as
C

試題分析：考察倍數(shù)表達(dá)。倍數(shù)表達(dá)有四種：1. “A+倍數(shù)+形容詞或副詞的比較級(jí)+than+B”， 2.“A+倍數(shù)+as+形容詞或副詞的原級(jí)+as+B”， 3. “A+倍數(shù)+the size/height/length/width， etc+of+B”， 4. “……times+what+從句”。本題考察的是第一種表達(dá)。句意：你最好坐火車去那里，火車票價(jià)是機(jī)票價(jià)格的三倍。故C正確。
點(diǎn)評(píng)：倍數(shù)表達(dá)要牢記，倍數(shù)表達(dá)法是高中英語教學(xué)的重點(diǎn)，也是歷屆高考的熱點(diǎn)。當(dāng)我們要表達(dá)甲是乙的幾倍時(shí)，通常用句型來表示：
1. “A+倍數(shù)+形容詞或副詞比較級(jí)+than+B”，表示“A比B大（長(zhǎng)、高、寬等）多少倍”
This rope is twice longer than that one. 這根繩子是那根繩子的兩倍長(zhǎng)（比那根繩子長(zhǎng)一倍）。
2.“A+倍數(shù)+as+形容詞或副詞的原級(jí)+as+B”，表示“A正好是B的多少倍”。如：
Asia is four times as large as Europe. 亞洲的面積是歐洲的四倍。
3. “A+倍數(shù)+the size/height/length/width， etc+of+B”，表示“A正好是B的多少倍”。如：
This street is four times the length of that one. 這條街是那條街的四倍長(zhǎng)。
4. “……times+what+從句”。如：
The production is now three times what it was ten years ago. 現(xiàn)在的產(chǎn)量比十年前增加了兩倍。
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