Câu hỏi:

Read the followingpassage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions.

      Tigers are one of the most powerful and graceful animals in the world. The different species that still exist today, namely the Bengal, Indochina, Siberian, South China and Sumatra tigers are in danger of becoming extinct. Due to irresponsible hunting, the Bali, Caspian and Java tigers have already become extinct. This could soon happen to the other species too.

      In the past, tigers were considered as pests. With a smaller area to hunt, as man had taken up more of the land to build upon, the tigers found less areas for themselves to hunt. They thus turned to farms to get their food. Farmers' livestock were attacked by these tigers. People were then encouraged to hunt and kill these animals with the promise of rewards. Even after the threat of tigers on livestock was over, man continued to hunt tigers, this time for recreation. Poachers also hunt tigers for their body parts . The skin of tigers is much sought. Bones and other organs are also used as ingredients in traditional Chinese medicine. Although killing tigers is illegal, it is still being carried out and unless it is stopped, the remaining species of tigers will soon become extinct too.

How many species of tigers were there originally ?