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[填空题]When people feel sick, doctors treat them. So, who treats animals Veterinarians are{{U}} (1) {{/U}}. But they also protect human health.
Veterinarians are{{U}} (2) {{/U}}against animal diseases that{{U}} (3) {{/U}}. Diseases, like some kinds of bird flu, can spread to humans. Others, like{{U}} (4) {{/U}}, cause economic damage.
Some veterinarians in the United States{{U}} (5) {{/U}}. Some study diseases. Others work for drug companies and medical companies. And about half of all veterinarians care for more than one-hundred-million cats and dogs that{{U}} (6) {{/U}}.
Becoming a veterinarian is hard work. Students take two years of{{U}} (7) {{/U}}. They must learn in the classroom about animal biology, diseases, {{U}} (8) {{/U}}.
Then, they attend four years in a college of veterinary medicine. There, students work in laboratories and treatment centers to{{U}} (9) {{/U}}about animal health. They also learn to{{U}} (10) {{/U}}.
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