地球科学
TPO35-L4 Permian Extinction
Listen to part of a lecture in an Earth science class.
- 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
- 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.
- 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
- 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.
- What does the professor emphasize about some of the rock samples taken from the Bedout High near Australia?
[CHOOSE 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.
- 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.
答案：
D C A D BC B
