甲、乙、丙三种固体物质的溶解度曲线如图所示，下列说法错误的是（ ）
A．若甲固体中含有少量乙，可用降温结晶的方法提纯甲
B．要使35℃时接近饱和的甲溶液变成该温度下的饱和溶液，可采用恒温蒸发溶剂的方法
C．25℃时，将20g甲固体加入到50g水中，充分溶解并恢复到原温度后，得到溶液的质量为70g
D．将35℃时丙的饱和溶液降温到25℃，则其溶液的溶质质量分数不变
答案：C
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| A spoken language is like a person: it grows and changes. One way its changes is by adding new words and phrases, usually through borrowing. Just as someone borrows a pencil from a classmate in order to finish work, languages borrow words from other languages in order to fill what is called a "word gap". A word gap happens when a language has no term, synonym, or easy translation for an object or activity. One way a language finds something to fill a word gap is to borrow a word from another language. Unlike a person, language never really returns words to their starting place. Instead, the words remain and become part of the borrowing language. We see this borrowing course at work in English in different ways and for different reasons. English, like any other language, will probably continue to borrow words from other languages as long as it continues to change — in other words, for as long as people continue to speak.
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