Scores of students turned out in black yesterday to support a protest against the examination authority for using too many multiple-choice questions and what one said was 'confusing Cantonese slang' in recent Chinese language examinations. The black-shirt movement was launched online last week after students sat the listening and integrated skills exam for the Hong Kong Certificate of Education Examination in Chinese language. Form Five student Wong Tak-sing, 17, was one of a large number of black-clad students among the roughly 700 sitting the HKCEE English language exam at Baptist Lui Ming Choi Secondary School in Sha Tin. Tak-sing said he supported the campaign and had urged his friends to wear black. 'The exam authority should set exam questions using news and current affairs materials instead of testing us with random Cantonese slang,' he said. 'Some were so ridiculous that we couldn't figure out what they meant. We felt like they are treating us like laboratory rats.' However, 17-year-old Carolyn Kwok Ah-lam, another black-clad student at the Sha Tin exam centre, said there was no special reason for her choice of attire and she had no objections to the content of the exam. Students had also been urged to join a rival campaign by wearing white to show support for the authority. But no one in white approached yesterday said they were taking part in the campaign. A spokeswoman for the Hong Kong Examination and Assessment Authority said any students who felt disgruntled should voice their discontent through official channels, such as by calling the public examination information centre. Lui Ming Choi Secondary School was one of three exam centres in the district which lay close to the route of the Olympic torch relay. School principal Cheng Cho-chak said the morning's examinations had not been disturbed by the event. The windows of 18 classrooms and the assembly hall had to be closed to shut out the noise outside, but air conditioners were turned on. Mr Cheng said the school had arranged with relay organisers to change the route after last month's rehearsal to minimise the noise impact on examinations. 'Our school's roof would have been an excellent place from which to watch the torch relay,' Mr Cheng said. 'But we have to put candidates' interests first.'