[填空题]

{{B}} Questions 47 to 56 are based on the following passage.{{/B}}
The partnership between humans and animals dates back to the first domestication of animals in the Stone Age, as long as 9,000 years ago. But never have animals provided such {{U}} (47) {{/U}} and particular help to humans as they do today in the form of trained {{U}} (48) {{/U}} to people with disabilities. These animals, usually dogs, help people {{U}} (49) {{/U}} tasks that would otherwise be difficult or even impossible. Service animals are not {{U}} (50) {{/U}} but working animals doing a job; thus, {{U}} (51) {{/U}} such as the Americans with Disabilities Act(1990) in the United States and the Disability Discrimination Act (1995) in the United Kingdom make service animals exempt from rules that {{U}} (52) {{/U}} animals from public places and business.
The most familiar service animals are guide dogs whose job is to help people with {{U}} (53) {{/U}}weakne

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