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1、阅读理解Elevenyearold twins Luke and Ryan Novolsel of Wilmette，Illinois，had a goal. The fifthgraders wanted to set a Guinness world record.Ryan Novolsel and his twin brother Luke hope that Guinness World Records will recognize their school for having the most sets of twins in a single grade. Some of the
2、ir 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 ama
3、zed to discover 24 sets of twins in all.“We were absolutely shocked， ”Luke and Ryans 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，and is shared by Valley Southwoods Freshman High S
4、chool in Iowa，Staples High School in Connecticut，and Maine South High School in Illinois.Earlier this year，Luke and Ryanwith help from their parentssent an application to Guinness. They added birth certificates，photos，and proof that all of the sets of twins attend Highcrest Middle School. They expec
5、ted 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 bi
6、rth 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 schools principal，said he is proud of his students effort.“I think it is wonderful that t
7、hey 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。1According to Paragraph 2，what Luke and Ryans friends did shows that _Athey
8、really have a gift for doing sportsBthey are interested in setting a Guinness world recordCthey have tried many things to inspire Luke and RyanDthey are trying their best to help the twins set a world record答案 B 推理判断题。根据第二段的 Some of their.came close.可知 Luke 和 Ryan 的一些朋友已经尝试过创造一些世界纪录了，故可推断他们对创造世界纪录很感
9、兴趣。2From Nancy Fendleys response in Paragraph 3，we infer that Luke and Ryan _Ahad thought they were the only twins at their schoolBdidnt expect there were so many twins at their schoolCthought there would be at most 16 pairs of twins at their schoolDfelt disappointed when they figured out the number
10、 of twins at their school答案 B 推理判断题。根据第三段的“We were.told the Associated Press.可知这对双胞胎没有料到他们学校里有这么多双胞胎。 ”3We know that compared to over thirty years ago，now in America _Amothers tend to give birth to babies in their early 20sBmothers are less likely to give birth in their 30sCmothers are more likely t
11、o give birth to twinsDmothers want to have more kids答案 C 细节理解题。根据第五段的 In 2009，one.in 53 infants in 1980.可知跟三十多年前相比，现在双胞胎出生率更高。4What is Dave Palzets attitude toward his students effort?AAngry. BWorried.CIndifferent. DSupportive.答案 D 推理判断题。根据末段的“I think it is wonderful.Highcrest Middle School， ”he sai
12、d.可推断 Dave Palzet 支持学生们的行为。阅读理解，阅读理解，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 causes materials to mix quickly or to dis
13、solve(使分解，使溶解) in liquids. Paint manufacturers(制造商) use ultrasound to do a better job of blending colors. The companies that make film for your camera find that mixing chemicals by the use of sound waves will produce a more sensitive film. The new lightweight(轻量的) type of washing machine uses ultras
14、onic waves to get clothes clean. Its special ultrasound generator is put into a pail of soapy water containing the soiled clothes. The sound waves drive the soapy water back and forth through the cloth so fast that everything is soon clean. There is also a new kind of dishwasher that works in much t
15、he same way. Ultrasonic waves can shake a liquid so fast that tiny holes form all through it. The liquid is actually torn apart by this action. Almost as soon as these holes are made, they fall together again. The result is a powerful pounding action. In the dairy industry this is used for the doubl
16、e purpose of making homogenized(使均匀，使匀质) milk and sterilizing(使无菌) it at the same time. If you look at some raw milk with a microscope, you find that it is made up of little drops of butter fat floating around in a watery liquid. In order to make milk easier to digest, these fat droplets(微粒) may be broken up by forcing the milk through very small openings. The result is called homogenized milk. When the ultrasonic met
