TPO19-L3
Salt marshes
Listen to part of a lecture in a marine biology class.
- What is the lecture mainly about?
- A. The effect of the tidal flow on the salt marsh
- B. Ways that some plants have adapted to living in salt marshes
- C. The process of osmosis in plants
- D. Differences between plants that grow in salt marshes and plants that grow elsewhere
- What is one result of reverse osmosis in the spartina?
- A. Salt from seawater strengthens the plant’s cells.
- B. All parts of the plant are able to receive oxygen.
- C. Salt evaporates off the stems and leaves of the plant.
- D. Water is unable to move across the plant cell walls.
- Why does the professor mention reddish mud on the roots of a spartina?
- A. To illustrate the high density of salt-marsh soil
- B. To explain how spartina rhizomes move through the soil
- C. To point out the problems spartinas face in getting fresh water
- D. To provide evidence that oxygen is present in the spartina’s roots
- In what way are rhizomes important for spartinas?
- A. They allow plants to remain cool in direct sunlight.
- B. They reduce the possibility of plants being uprooted during storms.
- C. They help plants in dense soil process oxygen.
- D. They reduce the concentration of salt in the surrounding seawater.
- What can be inferred about the process that prevents spartinas from breaking in violent storms?
- A. It is the same process that helps them survive being immersed in saltwater.
- B. The process is also responsible for causing their air tubes to form.
- C. The process sometimes damages their rhizomes.
- D. Many other plants have developed a similar process.
- Listen again to part of the Lecture. Then answer the question.
Why does the professor say this: 🎧
- A. To point out an incorrect conclusion
- B. To clarify the meaning of a term
- C. To admit that there is little evidence of the phenomenon she just described
- D. To emphasize the difference between a fact and an opinion
答案：
B A D B A A