【正确答案】正确答案：The four basic requirements for the description of vowels are: the height of the tongue raising(high, mid, low); the position of the highest part of the tongue(front, central, back); the length or tenseness of the vowel(long vs. short or tense vs. lax)and the shape of the lips(rounded vs. unrounded).

【答案解析】解析：考查描写英语元音的四个基本要求：舌抬起的高度(高、中、低)；舌头最高部分的位置(前、央、后)；元音的长度或紧度(长一短或紧一松)；唇的圆展度(圆唇一展唇)。