2018年12月15日雅思阅读真题+题目+答案：The dinosaurs footprints and extinction

2018年12月15日雅思阅读真题+题目+答案：The dinosaurs footprints and extinction

A

EVERYBODY knows that the dinosaurs were killed by an asteroid. Something big hit the earth 65 million years ago and, when the dust had fallen, so had the great reptiles. There is thus a nice, if ironic, symmetry in the idea that a similar impact brought about the dinosaurs' rise. That is the thesis proposed by Paul Olsen, of Columbia University, and his colleagues in this week's Science.

B

Dinosaurs first appear in the fossil record 230m years ago, during the Triassic period. But they were mostly small, and they shared the earth with lots of other sorts of reptile. It was in the subsequent Jurassic, which began 202 million years ago, that they overran the planet and turned into the monsters depicted in the book and movie "Jurassic Park". (Actually, though, the dinosaurs that appeared on screen were from the still more recent Cretaceous (白垩纪) period.) Dr Olsen and his colleagues are not the first to suggest that the dinosaurs inherited the earth as the result of an asteroid strike.But they are the first to show that the takeover did, indeed, happen in a geological eye blink.

C

Dinosaur skeletons are rare. Dinosaur footprints are, however, surprisingly abundant.And the sizes of the prints are as good an indication of the sizes of the beasts as are the skeletons themselves. Dr Olsen and his colleagues therefore concentrated on prints, not bones.

D

The prints in question were made in eastern North America, a part of the world then full of rift valleys similar to those in East Africa today. Like the modem African rift valleys, the Triassic (n.三叠纪)/ Jurassic American ones contained lakes, and these lakes grew and shrank at regular intervals because of climatic changes caused by periodic shifts in the earth's orbit (A similar phenomenon is responsible for modem ice ages.) That regularity, combined with reversals in the earth's magnetic field, which are detectable in the tiny fields of certain magnetic minerals, means that rocks from this place and period can be dated to within a few thousand years. As a bonus, squishy (adj.粘糊糊的)lake-edge sediments are just the things for recording the tracks of passing animals. By dividing the labour between themselves, the ten authors of the paper were able to study such tracks at 80 sites.

。。。。。余下雅思阅读真题省略！

雅思阅读真题题目如下：

Questions 1-6

Do the following statements agree with the information given in Reading Pasagel?

In boxes 1-6 on your answer sheet, write

YES         if the statement agrees with the information

NO          if the statement contradicts the information

NOT GIVEN   if there is no information on this

1. Dr Paul Olsen and his colleagues believe that asteroid knock may also lead to dino-saurs' boom.

2. Books and movie like Jurassic Park often exaggerate the size of the dinosaurs.

3. Dinosaur footprints are more adequate than dinosaur skeletons.

4. The prints are more detectable than earth magnetic field to track a date of geological precise within thousands years.

5. Ichnotaxa showed that footprints of dinosaurs offer exact information of the trace left by an individual species.

6. We can find more Iridium in the earth's surface than in meteorites.

。。。。。余下雅思阅读真题题目及答案省略！

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