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1、2014年12月大学英语四级听力练习(11)2900字 毕业为广大考生分享“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
2、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 cau
3、ses 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 canc
4、er, 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, Youre fine, go home.Ms. Palacio is now cancer free. But the standard two-dimensional mammogram missed all three of her tumors.Many doctor
5、s - 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
6、 dense breast tissue, were 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 Hoefts tumor.It was a very small tumor. It was only an 8 mi
7、llimeter tumor that couldnt 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 mammogram
8、s 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 Hou
9、se 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！
