https://online2.tingclass.net/lesson/shi0529/10000/10090/nature05.mp3
https://image.tingclass.net/statics/js/2012
A: Why are you spraying pesticides?
B: To kill the insects in the garden.
A: Not all insects are bad.
B: They are ruining my vegetables.
A: You should buy the right kind of poison.
B: What do you mean?
A: Some poisons kill bees.
B: That's alright. Bees sting people.
A: Without bees, your garden will not have fruit.
B: Why is that?
A: Bees pollinate the flowers so fruit can grow.
B: Help me pick out a pesticide that is safe for bees.