In February, an Indian environment group made a report saying drinks made by Coca­Cola and Pepsi contained pesticides and called for tougher safety standards. The US firms strongly rejected the findings of the New Delhi­based Centre for Science and Environment and said their products were safe.

　　21．The writer's purpose of writing this passage is to ________.

　　A．tell an interesting incident

　　B．warn people that some drinks might be dangerous to health

　　C．suggest using Coca­Cola to kill pests

　　D．announce a new discovery of Coca­Cola

　　22．The drink makers wouldn't accept the fact that their drinks could kill pests because

　　________．

　　they thought it went against science

　　B．they believed that the farmers didn't tell the truth

　　C．they might fear that it could bring harm to their business

　　D．they insisted that no poison was left in their products

　　23．The underlined part “this practice” in Para.3 probably refers to “________”．

　　Atesting the mixture

　　B．selling more drinks in India

　　C．mixing the drinks with pesticides

　　D．attracting ants to eat the young pests

　　24．The drinks can kill pests because ________．

　　there are some pesticides left in them

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