C2
对话
1. Why does the man go to see the professor?
To get feedback on a draft of a paper he is writing
To submit copies of sources for a paper he is writing
To discuss the possibility of changing the topic of his paper
To find out why he received a low grade on his paper
2. The speakers discuss the benefits of mutualism between ants and acacia plants.Which of the following benefits do they mention?（多选题）
The acacia plant provides a habitat for ant larvae.
The thorns of the acacia plant contain chemicals that discourage predators from attacking ants.
The ants attack animals that try to eat the leaves of the acacia plant.
The ants release a chemical that helps the acacia plant grow.
3. What does the professor tell the man that is new information to him?
All ant species have a mutualistic relationship with some plant species.
Not all species of acacia plant have thorns.
Some ant species feed on the leaves of acacia plants.
Some species of acacia plant do not have a mutualistic relationship with ants.
4. What does the professor say the man should include in his paper?
Information about different ant habitats
Examples of nonmutualistic relationships between species
Alternative definitions of the concept of mutualism
Examples of other species that have mutualistic relationships
5. What feature of the man’s paper does the professor most like?
The writing style
The ideas about the ecologičal consequences of mutualism
The discussion about why mutualism is so common among species in South America
The hypothesis about why some species develop mutualistic relationships
