| 摘要 |
The second and third pages have an area for checking the student answers, and the third and fourth pages are glued together to conceal the correction marker printed on the fourth page. The back of the first page permits checking of the answers on the second page, which page has a projecting tab facilitating its removal. The first and third pages have carbon copying facilities on their rear surfaces, and once the pages are disassembled secrecy is maintained. - |
