1) Why can be some dogs trained to be sniffer dogs? a) They have great sense of hearing b) They have keen sense of smell. c) They can tell who the bad guy is. 2) What are sniffer dogs trained to do? a) Help people by their keen sense of smell b) Guard the owner's house when they are away c) keep wild animals away 3) In Pingtung, when a sniffer dog sits down beside a tree and waits for its trainer, it means ___? a) It finds a missing child. b) It locates a infected tree. c) It knows there will be an earthquake. 4) Why are sniffer dogs important in dealing with brown root rot disease? a) People won't be infected with this disease too. b) The roots of the trees are useful. c) Infected trees won't fall and hurt people.

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