In addition, over the past 150 years, many non-native plants, mollusks(软体动物), insects, fish, birds, mammals, and diseases have found their way to Wisconsin. These “aliens” are often aggressive competitors with native wildlife, especially after they’ve left their own natural environments and controls.

　　Last but not the least, some native wildlife can become a problem when released from their natural population controls. When wolves are scarce and hunters too few, white-tailed deer will often strip(剥夺) the woods of native wildflowers and even certain tree species, when their populations are allowed to become too high. Canada geese are beautiful birds, but when city people feed native geese as if they were pets, their populations can rise to uncomfortable levels in urban areas, resulting in polluted waterways and manure-laden lawns.

　　5. What’s the second paragraph mainly about?

　　A. Endangered wildlife.

　　B. Habitat Loss.

　　C. Adaptation to conditions.

　　D. Population growth.

　　6. What can we learn from the passage?

　　A. Non-native species do affect the lives of native species.

　　B. Non-native species get along well with native species.

　　C. Too many Canada geese won’t cause problems.

　　D. Wolves can get along well with white-tailed deer.

　　7. The best title for the passage is _______.

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