答案：B
5.考点：近义词
辨析：turn --- get by buying and selling:
change --- give or receive the equivalent of (money) in lower denominations or in foreign currency.
float --- find a level in relationship to other currencies solely in response to the law of supply and demand: allowed the dollar to float.
fluctuate -- cause to rise and fall or vary irregularly: fluctuating prices / Prices fluctuate from year to year.
答案：D
6考点：近义词与习惯搭配
辨析： intermediate --- lying or occurring between two extremes or in a middle position or state
middle --- central:
medium --- middle quality or degree: stick to a happy medium (avoid extremes)
mid --- middle: from mid March to mid April
答案：A
在语言习得理论中有一个术语叫 “intermediate language”，翻译成汉语是“中介语”。