例2 TPO21 Lecture3 Biology
27/34. Why does the professor mention the brown tree snake?
A. To support a hypothesis about the evolution of constrictor snakes
B. To support a hypothesis that venomous snakes evolved from constrictor snakes
C. To give an example of a snake species that was never venomous
D. To give an example of a type of snake that can change its color
解题思路:
- 听力讲座的主旨是通过分析毒液的DNA而进一步了解蛇的进化过程
- 排除掉过于极端的
- 排除掉没有出现的观点
例3 TPO29 Lecture1 Ecology
7/34 According to the professor, in what way is the soil in forested areas generally different from soil in other areas?
A. In forested areas, the soil tends to be warmer and moister.
B. In forested areas, the chemistry of the soil changes more rapidly.
C. In forested areas, there is usually more variability in soil types
D. In forested areas, there is generally more acid in the soil.