Some of Man's closest relatives in the animal kingdom are under serious threat because of human activity, according to a recently published report. According to the document, almost one in three of all apes and monkeys - that is non-human primate species (灵长类动物) are now considered to be in er of dying out and disappearing from our planet, if action is not taken soon. The report, which was produced for the World Conservation Union (WCU), states that 114 of the world's 394 primate species could be lost forever, and the main reason they are threatened is the continuing destruction of forests where most of these animals live. In addition, illegal wildlife trade, climate change and commercial hunting for meat are also pressuring existing primate populations. What's more, the problem is getting more serious. The number of species on the organization’s Red List - listing those primate species most threatened and in very serious er of dying out - has increased by 3 to 25 since 2005. Russell Mittermeier, the chief researcher of the WCU report, said, 'You could fit all the surviving members of these 25 species in a single football stadium. So the problem is obviously urgent.' The scientists, who drew up the Red List, believe that the situation is now so bad that if action is not taken immediately, it will result in primate species becoming extinct - something which has not happened in over a century. The loss of habitat caused by the clearing of forests for wood, farmland and fuel continues to be the main reason for the declining number of primates, according to the report, and the problem was most severe in Asia. The loss of forest trees is also responsible for approximately 20 percent of all greenhouse gases - more than all the cars, trucks, trains and aeroplanes in the world combined. Mr. Mittermeier added, 'By preserving the world's remaining forests, we save primates and protect other animals while pring more pollution from entering the atmosphere to warm the climate.' 46．What is the main subject of the report discussed in the text? A．Climate change.         B．Loss of animal habitat. C．Enered animals.       D．Animal protection. 47．According to the text, when did an ape or monkey species last die out? A．In 1908．                B．In 2005. C．Over a hundred years ago.     D．Almost a hundred years ago. 48．How many animals were on the Red List in 2005? A．19． B．22． C．25． D．28. 49．The spokesman refers to 'a football stadium' in paragraph 5 to stress that ______. A．the animals enjoy playing sports B．there are not many of these animals left C．these animals should be placed there for protection D．the report was announced there 50．What is the main cause of the greenhouse gas problem according to the text? A．Aeroplanes.           B．Road vehicles. C．Factory pollution.        D．Loss of trees.