Narrator: Listen to part of a lecture in a biology class. Professor: Now, many people assume that all bats use echolocation to navigate and hunt. But that's not entirely true. Fruit bats, especially those in the Old World, rely heavily on vision and smell. In fact, their eyes are quite large and adapted for low-light conditions. Take the flying fox, for example. It has a keen sense of smell to locate ripe fruit, and its eyesight is good enough to see in dim twilight. Interestingly, some fruit bats also produce a kind of click with their wings, which helps them avoid obstacles in dense forests—but this is not the same as the high-frequency echolocation used by insect-eating bats. So, while echolocation is a remarkable adaptation, it's not universal among bats. The diversity of sensory strategies is a key point in their evolution. Any questions?
❓ 题目 What is the main point the professor makes about fruit bats?
A. A. They use echolocation more than vision.
B. B. They rely on vision and smell rather than echolocation.
C. C. They cannot see in low-light conditions.
D. D. They are the only bats that produce wing clicks.
✅ 正确答案
B. They rely on vision and smell rather than echolocation.