Topic 议题：toucan bird’s billed 的三种功能
Reading：3 reasons can explain why toucan evolved a bill.
Listening：None of the 3 reasons about the bill’s function is reasonable.
Reading：Weapons against predators
Listening：It cannot function as weapons. It is made of hollow bones filled with air, so it is thin and lightweight or else it cannot fly. If it is used as a weapon, it will be easily damaged in activities like jabbing.
Reading：Color and shape to hide from predator
Listening：They have to call out to each other in order to use the color and shape to blend into surrounding areas. If they do this, they are going to draw attention from predators.
Reading：Get rid of excess body heat
Listening：Healthy toucan does not use their bills. They need bill to get rid of heat in the daytime but at night when the temperature is lower, they do not. They then need to retain body heat.
Do you agree or disagree with the following statement? It is as important for older people to study and learn new things as it is for young people.