官方真题Official35托福听力Lecture 4真题文本免费分享
- 2017年06月05日16:19 来源：小站教育作者：小站托福编辑
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官方真题Official 35-L4
1. What does the professor mainly discuss?
A. New evidence about what happened to dinosaurs.
B. New methods for gathering evidence about mass extinctions.
C. The link between two mascons from the Permian period.
D. A possible cause of the Permian extinction.
2. According to the professor, why did researchers begin looking for evidence that an asteroid may have caused the Permian extinction?
A. They discovery that mascons on the Moon were caused by asteroid impacts.
B. They found rock samples in Wilkes Land that appeared to be 250 million years old.
C. The theory that an asteroid caused the dinosaur extinction gained acceptance.
D. The theory about a decline in seawater oxygen levels proved to be false.
3. Why does the professor mention getting a bump on the head?
A. To help students understand an explanation of how a mascon forms.
B. To illustrate a theory about how the supercontinent broke apart.
C. To show the relationship between an asteroid and the dinosaur extinction.
D. To compare the dinosaur extinction to the Permian extinction.
4. What did researchers notice that could be evidence of an asteroid impact in Wilkes Land?
A. A ring of ice containing a high concentration of oxygen.
B. A portion of Earth's crust that is less dense than normal.
C. Extraterrestrial rock fragments lying below the ice.
D. Relatively high gravity measurements in the center of a circular ridge.
5. What does the professor emphasize about some of the rock samples taken from the Bedout High near Australia?
Click on 2 answers
A. They are similar to the samples from the Yucatan peninsula in Mexico.
B. They are from the same time period as the Permian extinction.
C. They have been exposed to extreme temperatures and pressure.
D. They contain fossils of many species that are now extinct.
6. What does the professor imply when he says this:
A. The student should read the assignments before coming to class.
B. The student has not fully understood a statement in the textbook.
C. The student has not provided sufficient evidence to disprove the theory in the textbook.
D. The only reasonable explanation is the theory that the student suggests.
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