A. FOR WHICH B. WHERE C. FOR WHOM D. WHOSEREAD THE FOLLOWING PASSAGE A...

Câu 29:A. for which B. where C. for whom D. whoseRead the following passage and mark the letter A, B, C, or D on your answer sheet toindicate the correct answer to each of the questions from 30 to 34.A theme park in France has established a novel and environmentally-friendly way ofkeeping its grounds free of litter. It has selected and trained six "intelligent" rooks to pick uprubbish and keep the park clean.Rooks are members of the crow family and are up to 47cm in length. The clever birds willbe put to work at the Puy du Fou theme park in the west of France. They have been trainedto pick up cigarette ends, paper and other things people throw on the ground. The birds pickup the litter and deposit it into a special trash can, which then delivers some bird feed as areward. The more litter the birds put in the trash can, the more food they get.The head of the theme park, Nicolas de Villiers, explained the rationale of using the crowsto the AFP news agency. He said there were several reasons for deploying the crows. Hesaid: "The goal is not just to clean up, because the visitors are generally careful to keepthings clean, but also to demonstrate that nature itself can teach us to take care of theenvironment." Crows are highly sociable and intelligent birds. Some biologists say they areas smart as a seven-year-old child. Mr De Villiers said: "In an affectionate, supportiveatmosphere, they like to communicate with humans and establish a relationship throughplay." The crows are speedy workers and can fill a bucket with rubbish in less than 45minutes.