第10题: [单项选择]影响社会地位的流动是（）。 A. 垂直流动 B. 水平流动 C. 代际流动 D. 扁平化流动 参考答案:A
第11题: [简答题]Mention a labiodental sound in English. Tell what speech organs are involved in producing labiodental sounds. 参考答案:
/f/ and /v/. Labiodental sound is made with the lower lip and the upper front teeth. /f/ and /v/, as in fire and via, are produced by raising the lower lip until it nearly touches the upper front teeth.
答案解析:
本题考查的是唇齿音，一般为下唇与上齿，相互接触发出的声音。
