Erica David lives in Pinedale.Wyoming.USA.where winter can bring temperatures of below 35degrees Fahrenheit.howling winds.and a lot of snow．So it was just natural that she chose to study snow for her 题目和参考答案——青夏教育精英家教网—

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5．Erica David lives in Pinedale，Wyoming，USA，where winter can bring temperatures of below 35degrees Fahrenheit，howling winds，and a lot of snow．So it was just natural that she chose to study snow for her school science fair in the sixth grade．
Now a junior in high school，Erica is in her sixth year of snow experiments，and is well on her way to becoming a snow expert．She started with a basic question：Could snow fences be built to work better？
Snow fences are used to keep snowdrifts（雪堆）from covering areas like roads of train tracks，or to help build up snow where it can help with water shortages in spring when it melts（融化）．"Also，I wanted to protect my animals better from blowing snow，"says Erica，who raises goats，sheep，and pigs．
Before she could test fence designs，Erica had to figure out what would act like real snow in her experiments．"I tested flour，sugar，and salt before I settled on dishwasher powder，"she explains．
Science fairs offer students the chance to test theories，present findings to judges，and meet other researchers．Erica's many achievements include competing at the Discovery Channel Young Scientist Challenge for middle school students and the Intel International Science and Engineering Fair，where students from around the world present their science research．
But perhaps the best reward is that her research is already being put to good use．She has come up with an improved snow fence design，and this year she's helping think out how to provide water supply to native plants，which have been killed off by drilling at nearby natural gasfields．
"Science fairs are an amazing experience，"says Erica．"Just pick your true feeling and go for it．"

72．What does the passage suggest to us？C
A．Science fairs are held for high school students in America．
B．Erica is the youngest show expert well known in America．
C．The environment brought much convenience for Erica to study snow．
D．The hope to contribute to her hometown made Erica experiment on snow．
73．In Erica's hometown，snow fences may play a part inD．
a．reducing the harm blowing snow does to animals
b．supplying water resource to the nearby gas fields
c．making up for the lack of water resource．
d．keeping the traffic smooth
A．a，b，c           B．a，b，d
C．b，c，d            D．a，c，d
74．Science fairs are attractive to students because theyB．
A．can have their research put into practical use
B．can have their scientific ideas tested out
C．are allowed to help protect the local wildlife
D．can learn about the most advanced technology
75．Which of the following material can best replace snowing in Erica's experiment？D
A．Flour．        B．Sugar．
C．Salt．          D．Dishwasher powder．

分析文章讲述了Erica住在美国怀俄明州的Pinedale，在那里冬天有狂风和许多雪．因此很自然的在六年级的学校科学展上她选择了研究雪花．现在Eric是高三学生，有着六年的雪花试验的经验，她正在成为了一名雪的专家的路上．她从一个基本问题上开始着手：防雪栅栏是否可以制作得更好？防雪栅栏用来防止雪堆覆盖路面或者铁道，也可以用来累积雪，等融化的时候可以存水．而且，我想保护动物以免受到吹雪的伤害．Eric这样说．她养了山羊，绵羊和猪．

解答 72．C 73．D 74．B 75．D
72．C 根据文章第一段Erica David lives in Pinedale，Wyoming，USA，where winter can bring temperatures of below 35degrees Fahrenheit，howling winds，and a lot of snow．So it was just natural that she chose to study snow for her school science fair in the sixth grade．可知，Erica住在美国怀俄明州的Pinedale，在那里冬天有狂风和许多雪．因此很自然的在六年级的学校科学展上她选择了研究雪花．其他选项不符合文意，故选C
73．D 根据Snow fences are used to keep snowdrifts（雪堆）from covering areas like roads of train tracks，or to help build up snow where it can help with water shortages in spring when it melts（融化）．"Also，I wanted to protect my animals better from blowing snow，"says Erica，who raises goats，sheep，and pigs．可知雪栅栏并没有为附近的gas fields提供水源，故选D
74．B 根据Science fairs offer students the chance to test theories，present findings to judges，and meet other researchers．可知，Science fairs 吸引人的地方是可以试验一下他们的科学点子，故选B
75．D 根据．"I tested flour，sugar，and salt before I settled on dishwasher powder，"she explains．可知，最终使用的dishwasher 作为实验材料来代替雪，故选D

点评阅读理解题测试考生在阅读基础上的逻辑推理能力，要求考生根据文章所述事件的逻辑关系，对未说明的趋势或结局作出合理的推断；或根据作者所阐述的观点理论，对文章未涉及的现象、事例给以解释．考生首先要仔细阅读短文，完整了解信息，准确把握作者观点．

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