Read the text in A again and underline the linking verbs

Today, animal extinction remains a big concern of environmentalists. In fact, over the past few years, some species have become extinct, and many more are in critical danger as a result of human activities. Wildlife protection has proven more important than ever.

The Moholoholo Wildlife Rehabilitation Centre in South Africa works hard to protect local wild animals. This rescue center saves many species from dangerous situations. Sometimes the animals seem badly injured or poisoned, and often they have been orphaned because of poaching. The center looks after the animals carefully. Some recover quickly and can be released into the wild again rapidly. However, others seem more vulnerable and have to stay permanently. The center also offers an education program. People who feel interested in conservation can visit the center to learn about wildlife and environmental protection.