4008-125-888
暑假班8折优惠(限5月报名)
首页>托福考试备考专区>TPO写作>托福TPO24综合写作(含听力和阅读文本)

托福TPO24综合写作(含听力和阅读文本)

2015年05月20日 10:50来源:上海新航道作者:上海管理员

摘要:

小编为大家整理了全网最全托福TPO1-25综合写作文本,希望帮助考生更好的备考,争取理想成绩,实现留学梦想。下面是托福TPO24写作 部分。

TPO 24

Reading

Animal fossils usually provide very little opportunity to study the actual animal tissues, because in fossils the animals' living tissues have been largely replaced by minerals. Thus, scientists were very excited recently when it appeared that a 70-million-year-old fossil of Tyrannosaurus rex (T. rex), a dinosaur, might still contain remains of the actual tissues of the animal. The discovery was made when researchers deliberately broke open the T. rex’s leg bone, thereby exposing its insides to reveal materials that seem to be remains of blood vessels, red blood cells, and collagen matrix.

First, the breaking of the fossilized leg bone revealed many small branching channels inside, which probably correspond to hollows in the bones where blood vessels were once located. The exciting finding was the presence of a soft, flexible organic substance inside the channels. This soft substance may very well represent the remains of the actual blood vessels of T. rex.

Second, microscopic examination of the various parts of the inner bone revealed the presence of spheres that could be the remains of red blood cells. Tests showed that the spheres contained iron-a material vital to the role of red blood cells in transporting oxygen to tissues. Moreover, the spheres had dark red centers (substances with iron tend to be reddish in color) and were also about the size of red blood cells.

Third, scientists performed a test on the dinosaur leg bone that showed that it contained collagen. Collagen is a fibrous protein that is a main component of living bone tissue, in which it forms a so-called collagen matrix. Collagen (or its chemical derivatives) is exactly the kind of biochemical material that one would expect to find in association with bone tissue.

Listening

As much as we would like to have the remains of actual dinosaur tissue, there are sound reasons for being skeptical of the identifications made in the reading.

First, the soft, flexible substance inside the bone channels isn’t necessarily the remains of blood vessels. It is much more likely to be something else. Like what? You might say. Well, long after an organism is died, bacteria sometimes colonize hollows, empty areas in bones, like the channels that once held blood vessels. When bacteria lived inside bones, they often leave behind traces of organic material. What the researchers in the reading are identifying as blood vessels might just be traces of soft and moist residue left by bacteria colonies.

All right. What about the iron-filled spheres? Well, the problem is that scientists found identical reddish spheres in fossils of other animals found in the same place. That includes fossils of primitive animals that did not have any red blood cells when they were alive. Clearly, if these spheres appear in organisms that did not have any red blood cells, then the spheres cannot be the remains of red blood cells. The spheres probably have a very different origin. They are probably just pieces of reddish mineral.

Third, the collagen. The problem is that we have never found collagen in animal remains that are older than one hundred thousand years. Collagen probably cannot last longer than that. Finding collagen from an animal that lived seventy million years ago would really contradict our ideas about how long collagen can last. It is just too improbable. The most likely explanation for the presence of collagen is that it doesn’t come from the T.rex, but from another much more recent source. For example, human skin contains collagen, so the collagen may have come from the skin of the researchers who are handling the bone.

免费领取资料

免费领取最新剑桥雅思、TPO、SAT真题、百人留学备考群,名师答疑,助教监督,分享最新资讯,领取独家资料。

方法1:扫码添加新航道老师

微信号:shnc_2018

方法2:留下表单信息,老师会及时与您联系

热门课程

  • 走读班(6-10人)
  • 走读班(20-30人)
  • 住宿班(6-10人)
  • 住宿班(20-30人)
  • 托福一对一
课程名称 班级人数 课时 学费 报名
托福基础走读班(6-10人,争85/90分) 6-10人 144课时 ¥29800 在线咨询
托福全程走读班(6-10人,争100/110分) 6-10人 192课时 ¥39800 在线咨询
托福强化走读班(6-10人,争85/90分) 6-10人 96课时 ¥24800 在线咨询
托福十一特训班 6-10人 56 ¥15800 在线咨询
托福特训班(85分4周,走读) 8-10人 192 ¥34800 在线咨询
课程名称 班级人数 课时 学费 报名
托福全程走读班(20-30人,争100/110分) 20-30人 192课时 ¥13800 在线咨询
托福强化走读班(20-30人,争85/90分) 20-30人 96课时 ¥7800 在线咨询
托福冲刺走读班(20-30人,争100/110分) 20-30人 96课时 ¥8800 在线咨询
课程名称 班级人数 课时 学费 报名
托福基础住宿班(6-10人,争85/90分) 6-10人 144课时 ¥28800 在线咨询
托福全程住宿班(6-10人,争100/110分) 6-10人 304课时 ¥41800 在线咨询
托福词汇语法住宿班(6-10人) 6-10人 48课时 ¥8800 在线咨询
托福精听精读住宿班(6-10人) 6-10人 48课时 ¥8800 在线咨询
托福100暑期精英封闭班 10-15人 228时 ¥26800 在线咨询
课程名称 班级人数 课时 学费 报名
托福全程精讲住宿班(20-25人,争100/110分) 20-30人 192课时 ¥15800 在线咨询
托福基础强化住宿班(20-30人,争85/90分) 20-30人 96课时 ¥8800 在线咨询
托福精品冲刺住宿班(20-30人,争100/110分) 20-30人 96课时 ¥9800 在线咨询
课程名称 班级人数 课时 学费 报名
托福一对一 1 按需定制 在线咨询
托福精听精读十一特训班 在线咨询

免责声明
1、如转载本网原创文章,请表明出处;
2、本网转载媒体稿件旨在传播更多有益信息,并不代表同意该观点,本网不承担稿件侵权行为的连带责任;
3、如本网转载稿、资料分享涉及版权等问题,请作者见稿后速与新航道联系(电话:021-64380066),我们会第一时间删除。

  • 徐家汇校区
  • 人民广场校区
  • 地址:徐汇区裕德路126号

    乘车路线:地铁1、4号线上海体育馆、3号线9号线宜山路站、11号线上海游泳馆站

  • 地址:南京西路338号天安中心24楼

    乘车路线:地铁1、2、8号线人民广场站

  • 微信公众号
  • 微信社群

注册/登录

+86
获取验证码

登录

+86

收不到验证码?

知道了

找回密码

+86
获取验证码
下一步

重新设置密码

为您的账号设置一个新密码

保存新密码

密码重置成功

请妥善保存您的密码
立即登录

为了确保您的帐号安全

请勿将帐号信息提供给他人/机构