首页 - 网校 - 万题库 - 美好明天 - 直播 - 导航
您现在的位置: 考试吧 > 英语四六级考试 > 学习资料 > 英语四级 > 听力 > 正文

2014年12月大学英语四级听力练习(11)

来源:考试吧 2014-09-28 10:48:29 要考试,上考试吧! 英语四六级万题库
考试吧为广大考生分享“2014年12月大学英语四级听力练习”,希望对大家有所帮助,祝大家备考顺利!

  点击查看:2014年12月大学英语四级听力练习汇总

  听力音频点击下载

  Three-dimensional technology -- known as three-D -- gives depth to objects that would otherwise appear two-dimensional, or flat. Three-D makes movies and video games look more realistic. And now it could help save lives.

  For years, mammograms have played an important role in finding breast cancer. But these X-ray pictures of the human breast often miss dangerous lumps or tumors.

  And they also produce false positives. A false positive wrongly appears to show suspicious tissue. And that causes painful, unnecessary biopsies to examine that tissue.

  A new study shows that three-D technology could change the way doctors look for breast cancer.

  A woman undergoes a mammography exam, a special type of X-ray of the breasts used to detect tumors.

  When Zulima Palacio discovered she had breast cancer, it already had reached stage three. That means that the cancer was very dangerous.

  "Even a month before it was detected, I went for a sonogram and they told me, 'You're fine, go home.'"

  Ms. Palacio is now cancer free. But the standard two-dimensional mammogram missed all three of her tumors.

  Many doctors - including cancer surgeon Negar Golesorkhi - say standard mammography does not find enough cancerous tumors. She says looking for cancer in dense, thick breast tissue is like looking for a polar bear in a snow storm. In other words, it is very difficult.

  "When we look for cancer on a mammogram in a dense breast tissue, we're looking for a polar bear in a snow storm, so it would be very difficult to find."

  A few years ago, the U.S. Food and Drug Administration approved the use of three-D mammography. And three-D technology found Jennifer Hoeft's tumor.

  "It was a very small tumor. It was only an 8 millimeter tumor that couldn't be felt."

  Sarah Friedewald is a doctor at Lutheran General Hospital in the U.S. state of Illinois. She led a study to compare the results of three-D and two-D mammography from nearly a half million patients.

  Dr. Friedewald says they found more cancers using three-D mammograms versus, or compared to, two-D mammograms. And they found more cancers that kill.

  "We found invasive cancers or the cancers that we worry about, the ones that could potentially kill people more frequently in women who had the 3-D mammogram versus the women who just had the 2-D mammogram."

  The White House in Washington is bathed in pink light to celebrate Breast Cancer Awareness Month.

  Dr. Friedewald says tumors that are difficult to see on a standard mammogram are easy to find in 3 dimensions.

  Jennifer Hoeft is grateful that she had three-D mammography.

  "I truly, truly believe that the 3-D mammography is what caught my cancer early and is allowing me to pretty much live my life the way I want to."

搜索公众微信号"566四六级",获取最新四六级报名、备考信息!

  相关推荐:

  大学英语四级626分:考神刷分攻略

  2014年12月大学英语四级复合式听写技巧

  英语四级考试的误区:写给屡战屡败的四级考生

0
收藏该文章
0
收藏该文章
文章责编:zhaojing666  
看了本文的网友还看了
文章搜索
万题库小程序
万题库小程序
·章节视频 ·章节练习
·免费真题 ·模考试题
微信扫码,立即获取!
扫码免费使用
英语四级
共计423课时
讲义已上传
30206人在学
英语六级
共计313课时
讲义已上传
20312人在学
阅读理解
共计687课时
讲义已上传
5277人在学
完形填空
共计369课时
讲义已上传
13161人在学
作文
共计581课时
讲义已上传
7187人在学
推荐使用万题库APP学习
扫一扫,下载万题库
手机学习,复习效率提升50%!
版权声明:如果英语四六级考试网所转载内容不慎侵犯了您的权益,请与我们联系800@exam8.com,我们将会及时处理。如转载本英语四六级考试网内容,请注明出处。
Copyright © 2004- 考试吧英语四六级考试网 出版物经营许可证新出发京批字第直170033号 
京ICP证060677 京ICP备05005269号 中国科学院研究生院权威支持(北京)
精选6套卷
8次直播课
大数据宝典
通关大法!