2015
高考英语南宁市三月阅读理解、信息匹配练习（5）答案
阅读理解。阅读下列短文, 从给的四个选项 (a、b、c和d) 中, 选出最佳选项。
today, ultrasonic(超声的) waves are being put to work in laboratories and factories. if an ultrasound generator is placed in a liquid, the waves move the liquid back and forth hundreds of thousands of times each second. this ca
