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.

　　For Highcrest Middle School，the rise in twin births could be a ticket into the record books. Dave Palzet，the school's principal，said he is proud of his students' effort.“I think it is wonderful that they have taken it on themselves to research and work with the world record officials to obtain this great honor for Highcrest Middle School，”he said.

　　【解题导语】　Luke和Ryan发现他们学校有二十四对双胞胎他们向吉尼斯世界纪录提交了申请希望创造一项一所学校单年级双胞胎最多的世界纪录。

　　____________．

　　B．they are interested in setting a Guinness world record

　　C．they have tried many things to inspire Luke and Ryan

　　D．they are trying their best to help the twins set a world record

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