The book cost ten ______and fifty _____. (dollar, dollars; cent, cents)
英语中的dollar, cent, pound, penny, franc(法郎）均为可数名词。
例：The pen cost him five dollars.(three pounds, 50 francs), 这支钢笔花了他5美元（3英镑，50法郎）。
One dollar is equal to one hundred cents. 1美元等于100美分。
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