【正文】 ns that support new hippo protections。 some are even moving unilaterally to save the herds. Zambia restricts hippo hunting to tourist expeditions in national parks and gives local people 35 percent of the tourist revenues. That should encourage locals to help fend off poachers and to quit hunting hippos themselves. And if ivory hunters do leave the hippo alone? They39。ll probably move on to other animals with carvable teeth, like walruses or whales. 21. We may infer from the text that the hippo is [A] an endangered animal species. [B] a kind of tourist games. [C] a special fish in rivers. [D] an African elephant. 22. When Dr. Lyster said sadly that the hippo is the fotten beast, he meant that [A] people had fotten to make use of its teeth. [B] the hippo was threatening the existence of elephants. [C] there was an excessive number ofhippos in Africa. [D] the world only remembered to save elephants. 23. We may infer that the hippo hunting and trading are thriving because [A] there has been no strict rules to control these activities before this week. [B] consumers like hippo teeth products better than those made of ivory. [C] there are fewer elephants left in Africa than hippos. [D] hunters find that hippos are easier to kill than elephants. 24. Some African countries tried to protect animals in national parks by [A] getting the locals involved in the trade ofhippos. [B] reinforcing park police force. [C] sharing benefits from parks with the locals [D] turning hunting grounds into national parks. 25. The last sentence implies that walruses or whales may [A] move to other places where foods are available. [B] bee the next victim of hunters39。 targets. [C] outnumber elephants and hippos in the future. [D] bee tourist attractions in African national parks. Passage 2 Eating right to prevent heart disease may seem plicated and confusing, but it39。s a breeze pared with trying to design an anticancer diet. Cardiovascular disease is relatively simple。 it39。s the result of normal bodily processes taken to the extreme. Cancer, by contrast, involves changes in the programming of DNA within the nuclei of individual cells. Beyond that, heart disease is an illness that affects a single an system, while cancer is dozens of different diseases that target body parts as radically different as the brain, breast and bone. That being the case it39。s no surprise that the relationship between diet and cancer is still largely a matter of educated guessworkand in many cases, the guesses have turned out to be wrong. Take the much publicized link between highfat diets and breast cancer, for example. Women who live in Western countries, where highfat diets are the norm, tend to have high breastcancer rates. Even more telling: women of Japanese ancestry who live in the , get the disease six times more often than their grandmothers and greatgrandmothers in Japan. Yet a huge recent study of 90 000 women has refuted the breast cancerfat link. A similar process of educatedguessanderror led people to load up on the nutritional supplement beta carotene in the early 1990s. Scientists noted that those who eat lots of fruits and vegetables tend to get less cancer and speculated that carotenoidsthe same antioxidant substances that seem to protect against heart diseasewere responsible. In particular, they focused on beta carotene, the most abundant and mon carotenoid, as the most likely to prevent cancer. Yet a series of targeted studies in Finland and the . showed that beta carotene supplements don39。t ward off cancer at all. It looks like taking this substance in high doses is not the right thing to do, says a Harvard39。s researcher. Health experts are not ready to list the foods that will keep cancer at bay, but some broad outlines of an anticancer diet are taking shape. Beta carotene might not be the key. But fruits and vegetables seem to help. So along with giving up tobacco and limiting alcohol consumption, the best way to prevent a broad range of cancers, given the current state of medical knowledge, is to eat more fruits and vegetables. That sort of diet will help you stay trim and prevent heart disease anywayso if, against all odds, it turns out to have no effect on cancer, it certainly can39。t hurt. 26. We may conclude from the first paragraph that [A] heart disease is mainly caused by abnormal eating habits. [B] cancer is far more difficult to prevent than heart disease. [C] changing the programming of DNA may help treat cancer. [D] designing an anticancer diet is as easy as a breeze 27. Observations and studies of women living in the . prove that [A] American women are in better health than women of Japanese ancestry. [B] there is a clear relationship between highfat diets and breast cancer [C] Japanese women have not yet fully adapted to Western eating norm. [D] there is nothing conclusive in terms of the breast cancerfat link. 28. We can learn from the selection that beta carotene supplements [A] are ineffective in preventing heart disease. [B] may not be effective in preventing cancer. [C] are the most important nutrients we need [D] should normally be taken in low doses. 29. According to health experts, eating m