综合部分听力音频：
Task1
Some people believe that certain places on Earth should be preserved and protected forever from human development. Others believe that humans should be able to use and develop all areas on Earth as the human population grows. Which view do you agree with? Explain why.
Task2
Reading
Campus Tours Will No Longer Enter Library
The university recently announced that campus tours for prospective students and other visitors will no longer go inside the campus library. Current students have complained that having tour groups pass through the library is distracting and affects their studying, so to avoid future disruptions, the university has decided to prohibit tours inside the building. As an alternative, the university has developed a video tour of the library and posted it on the university Web site; prospective students and other visitors will still be able to experience the library’s interior by viewing this video tour online.
The man expresses his opinion about the plan described in the article. Briefly summarize the plan. Then state his opinion about the plan and explain the reasons he gives for holding that opinion.
Task3
Reading
Dimorphism
In many animal species, all the members of the species look similar to one another. However, in some species, certain members within the species look very different from others, displaying differences in color, size, and shape, which may correspond with varied survival needs. This phenomenon is known as dimorphism. One type of dimorphism involves male and female animals that look distinct from each other. Animals of the two genders may perform different roles that help ensure the survival of their species, and their dissimilar appearances help them perform these roles more effectively.
Explain how the example in the lecture illustrates the concept of dimorphism.
Task4
Using points and examples from the lecture, describe two employee retention strategies and how they work.
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