L2：
讲座
1. What is the main purpose of the lecture?
To illustrate how phytoliths are beneficial to plants
To demonstrate how phytoliths are used in scientific research
To compare methods of analysis used in archaeological study
D. To explain how maize was first domesticated
2. What is one way that phytoliths form?
Grains become preserved between mineral layers in soil.
Groundwater causes some of the plant tissue to decay.
Minerals from groundwater collect in the cells o f plants.
Leaves of plants photosynthesize sunlight into minerals.
3. What point does the professor make about closely related plants such as wheat and barley?
It was impossible to see the differences in the shape of their phytoliths until recently
Their seeds can be identified using election microscopes
It was unknown until recently that their phytoliths decay at different rates
D. Their phytoliths are typically found it in vessels used for cooking
4. Why does the professor discuss maize?
To point out that phytolith analysis has proven how widespread its cultivation actually
was
To provide an example of a plant whose phytoliths are unique
To emphasize the surprising number of subspecies that were suitable for domestication
To show that phytolith analysis can reveal the timing of a plant’s domestication
5. Why does the professor discuss the function of pollen?
To describe the reproductive process is some plants
To show why pollen does not decay as rapidly as other parts of plants
To explain why pollen can be an unreliable source for archaeologists
D. To illustrate why archaeologists find more pollen than phytoliths in soil
6. Why does the professor say this:
To provide an explanation for the statement she just made
To find out the students’ opinions about a research method
To review information about plant eaters from last class
D. To suggest that plant eaters have a difficult choice to make
