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Agnostids were a group of marine animals that became extinct about 450 million years ago. Agnostid fossils can be found in rocks in many areas around the world. From the fossil remains, we know that agnostids were primitive arthropods-relatives of modern-day insects. However, the fossil information does not allow paleontologists to determine with certainty what agnostids ate or how they behaved. There are several different theories about how agnostids may have lived.
Free-Swimming Predators
First, the agnostids may have been free-swimming predators that hunted smaller animals. It is known that other types of primitive arthropods were strong swimmers and active predators, so it is reasonable that the agnostids may have lived that way as well And while the agnostids were small, sometimes just six millimeters long, there were plenty of smaller organisms in the ancient ocean for them to prey on.
Seafloor Dwellers
Second, they may have dwelled on the seafloor. Again, there are examples of other types of primitive arthropods living this way, so it is possible that agnostids did too. On the seafloor they would have survived by scavenging dead organisms or by grazing on bacteria.
Parasites
Third, there is the possibility that the agnostids were parasites, living on and feeding off larger organisms. One reason that this seems possible is that there are many species of modern-day arthropods that exist as parasites, such as fleas, ticks, and mites. The agnostids might have lived on primitive fish or even on other, larger arthropods.
Directions: You have 20 minutes to plan and write your response. Your response will be judged on the basis of the quality of your writing and on how well your response presents the points in the lecture and their relationship to the reading passage. Typically, an effective response will be 150 to 225 words.
Question: Summarize the points made in the lecture, being sure to explain how they challenge the specific theories presented in the reading passage.
Directions: Read the question below You have 30 minutes to plan, write, and revise your essay. Typically, an effective response will contain a minimum of 300 words.
Question:
Imagine that you are in a classroom or a meeting. The teacher or the meeting leader says something incorrect In your opinion, which of the following is the best thing to do?
-Interrupt and correct the mistake right away
-Wait until the class or meeting is over and the people are gone, and then talk to the teacher or meeting leade
-Say nothing
Use specific reasons and examples to support your answer.
口语：
1. People set a variety of goals for themselves throughout their lives. Describe one goal you would like to achieve in the future, and explain why this goal is important to you. Include specific details in your explanation.
2. Some students attend college full-time, while others attend college part-time. Which do you think is better? Explain why.
3. Reading Time:
University Makes Changes to Orientation Program
Madison University is making a change to the orientation program for first-year students. In the past, as part of orientation, new, incoming students could go on a two-day hiking and camping trip together with other incoming students on the weekend before classes begin. In order to encourage more students to take advantage of the opportunity to get to know one another in an informal setting, the university will now offer a choice of activities: students will be able to either go hiking or participate in organized group games on campus. Additionally, these activities will last one day only, not two, a change many students had requested.
The man expresses his opinion about the change described in the article. Briefly summarize the change Then state his opinion about the change and explain the reasons he gives for holding that opinion.
4. Reading Time:
Population Changes
Populations of living beings are constantly changing The number of humans, animals, insects, or plants living in a given area can vary because of two kinds of factors: biotic and abiotic Biotic factors are living factors that can influence the size of populations, such as predators or other species competing for food. Abiotic factors are nonliving things in the surrounding environment that can cause population changes, such as weather or sunlight. Biotic and abiotic factors cause continual changes in the number of individuals that make up a population of organisms.
Using the examples of mice and rabbits from the lecture, describe the two different types of factors that can cause population changes.
5.The speakers discuss two possible solutions to their problem. Briefly summarize the problem Then state which solution you prefer and explain why.
6.The speakers discuss two possible solutions to their problem Briefly summarize the problem Then state which solution you prefer and explain why.
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