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兴文县高考英语一轮复习阅读理解训练1 阅读理解n－year－old twins Luke and Ryan Novolsel of Wilmette－graders wanted to set a Guinness world record. of twins in a single grade. Some of their friends had already tried to jump on a pogo stick longer than anyone else. One even attempted to produce the loudest burp(打嗝). But none of them came close. Then Luke and Ryan realized that there were lots of other twins in their grade at Highcrest Middle School. They did a full count，and were amazed to discover 24 sets of twins in all. “We were absolutely shocked，”Luke and Ryan's mother，Nancy Fendley，told the Associated Press. The boys figured they now had their Guinness record：most pairs of twins in one grade. The current record is 16 pairs Earlier this year，Luke and Ryan—with help from their parents—sent an application to Guinness. They added birth certificates，photos，and proof that all of the sets of twins attend Highcrest Middle School. They expected to hear back in several weeks on whether they actually set a new world record. Since 1980，twin birth rates have more than doubled in the United States，according to the Centers for Disease Control(CDC). The age of mothers has gone up over the years，and women in their 30s are more likely to give birth to twins. In 2009，one in every 30 infants was born a twin，compared with one in 53 infants in 1980. | 
