下列提高咀嚼效率的最佳选择是（）
A.吃较多的食物
B.缩短咀嚼时间
C.恢复患牙的正常功能
D.延长咀嚼时间
E.吃易碎食物
参考答案：C
A．超声波加湿器使药液雾化后让病人吸入治疗咽喉炎症
B．蝙蝠利用超声波确定食物及障碍的位置
C．医院利用“B超”检查体内情况
D．用超声波探测水库大坝是否有空隙裂纹
根据句意及首字母提示完成单词。
1. The film is about the Long M______? Have you ever seen it?
2. I'm going to fly there. Would you buy two a______ tickets for me?
3. Let's buy some pens and pencils at the s______ shop.
4. When Tim saw me, he w______ his hand to me.
5. You must wait for your turn in l______.
