聽力是六級考試中的重要題型，考生對這部分的復(fù)習(xí)一定不能松懈，考生可以充分利用暑期時(shí)間堅(jiān)持練習(xí)聽力，下面是一篇英語六級聽力練習(xí)，快來練練吧。

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."

全面掌握四六級考試信息，為備考復(fù)習(xí)做準(zhǔn)備！

什么人能考四六級：全日制?？啤⒈究?、研究生在校生可報(bào)考四六級，其中英語四級考試成績達(dá)到425分以上（含425分）的在校大學(xué)生才可報(bào)考六級，同一考試批次，四級和六級不能兼報(bào)。點(diǎn)擊查看更多>>

四六級什么時(shí)候考：大學(xué)英語四六級考試每年舉辦兩次，分別是6月中下旬的周六和12月中下旬的周六，具體時(shí)間每年略有不同，需查看本校教務(wù)處報(bào)名通知了解。點(diǎn)擊查看最新考試時(shí)間>>

四六級在哪兒報(bào)名：英語四六級考試現(xiàn)在都由各學(xué)校組織報(bào)名，一般會通過學(xué)校的教務(wù)網(wǎng)站或者各學(xué)院集體報(bào)名，報(bào)名后還有信息確認(rèn)的過程，部分學(xué)校需要電子攝像。點(diǎn)擊查看更多>>

四六級報(bào)名費(fèi)要多少：四六級報(bào)名費(fèi)用由各院校在報(bào)名時(shí)收取，不同地區(qū)及院校收費(fèi)標(biāo)準(zhǔn)不同，一般在15-70元不等，部分院校不設(shè)立現(xiàn)場交費(fèi)，采取從校園卡或銀行卡統(tǒng)一劃扣方式收取。點(diǎn)擊查看更多>>

四六級考試流程是怎樣的：英語四六級是同一天考試，上午考四級，下午考六級?？紙錾舷仍囈簦缓筮M(jìn)行作文部分答題，之后是聽力部分考試，最后是剩余題型考試。點(diǎn)擊查看更多>>

四六級分?jǐn)?shù)怎么計(jì)算：大學(xué)英語四、六級考試的分?jǐn)?shù)報(bào)道采用常模參照方式，不設(shè)及格線。四六級考試單項(xiàng)成績有四個(gè)部分，這四個(gè)部分以及所占的分值比例為：聽力占35%，閱讀占35%，翻譯占15%，作文占15%。點(diǎn)擊查看更多>>

四六級考試改革了哪些：CET考委會宣布從2013年12月考次起對英語四六級考試題型改革。本次四六級考試改革取消了完形填空、快速閱讀，增加閱讀理解匹配題，復(fù)合式聽寫改為單詞和詞組聽寫，句子翻譯改為短文漢譯英。點(diǎn)擊了解更多>>

四六級成績什么時(shí)候出：四六級考試成績一般是考后兩個(gè)月左右公布，一般在成績查詢開始前10天左右，四六級考委會網(wǎng)站會公布成績查詢通知，告知大家確切的成績查詢開始時(shí)間及成績查詢方式。點(diǎn)擊了解更多>>

四六級多少分過：四六級報(bào)道成績滿分為710分，凡成績在220分以上的考生，發(fā)給成績單，不設(shè)官方及格線。但考委會規(guī)定“四級成績達(dá)到425分以上（含425分）者方可報(bào)考六級”，故一般認(rèn)為四級及格線是425分。點(diǎn)擊了解更多>>