地质学
TPO15-L2 Geologic Time Periods
Listen to part of a lecture in a geology class.
- What is the lecture mainly about?
- A. Recognizing when one geologic epoch ends and another begins.
- B. How geologists determine the age of Earth.
- C. Whether humans have affected Earth’s climate.
- D. Identifying elements that affect the formation of sediment layers.
- Why does the professor mention the Pleistocene epoch?
- A. To explain how sediments change during an ice age.
- B. To give an example of a well-defined geologic epoch.
- C. To describe how certain environmental conditions affect erosion rates.
- D. To describe the factors that influence the naming of geologic epochs.
- Researchers study sediment in order to learn about the characteristics of past geologic epochs. What does the professor say that sediment reveals about a particular epoch?
[CHOOSE 2 ANSWERS]
- A. The climate on Earth then the sediment formed.
- B. The places on Earth with the highest amounts of rainfall.
- C. The level of the oceans at the time.
- D. The organisms that lived when the sediment formed.
- According to the professor, what is the significance of the year 1800 C.E?
[CHOOSE 2 ANSWERS]
- A. The human population reached 1 billion.
- B. The Anthropocene epoch was first described.
- C. Industrialization began to influence Earth’s environment.
- D. There was a significant change in the amount of sediment deposited around the world.
- What does the professor imply about the spread of agriculture 8,000 years ago?
- A. It was the true beginning of the Holocene epoch.
- B. It was when greenhouse gases were at their lowest levels.
- C. It was not a major cause of population growth.
- D. It did not cause as big an environmental impact as some researchers say.
- What does the professor say about future researchers?
- A. They may not agree that humans have had an important effect on Earth’s surface.
- B. They will not have reliable evidence of what is happening today.
- C. They will determine when the Anthropocene epoch began.
- D. They will make predictions about when the Anthropocene epoch will end.
答案：
A B AD AC D C
