✔ 最佳答案
1. Some LDCs(less developed countries) are still using DDT e.g. China, India
but it is illegal to use DDT in Hong Kong.
2. Advantages: kill pests efficiently, low cost when compared with other pesticides
Disadvantages: Harmful to human and the environment.
The excessive water drained from farmlands will pollute the environment
e.g. the rivers. The ecosystem of the river will be damaged.
3. Because farmers want good harvest without spending money on buying expensive but environmental friendly pesticides. DDT can kill pests efficiently and prevent pests from damaging the crops, so the crops will have a better outlook and the selling price of crops may increase.