.

　　A. they can provide support for visitors

　　B. they can give information to other species

　　C. they are not easily found out in their habitats

　　D. they are very sensitive to environmental changes

　　39. What is the text mainly about?

　　A. Visitors are being trained to identify butterflies.

　　B. Wildlife areas are being protected by butterflies.

　　C. Volunteers are being needed to count butterflies.

　　D. Organisations are being put up to protect butterflies.

　　B

　　When a storm is coming, most people leave the area as quickly ad possible and head for safety. But there are a few people who will get into their cars and go straight for the center of the storm. These people are willing to risk being killed by floods or 100-kilometer-an-hour winds for the excitement of watching the storm close up.

　　“Storm chasing” is becoming an increasingly popular hobby, especially in the Midwest of the United States, where there are frequent storms between March and July. A storm chaser begins the day by checking the Internet for the latest weather reports, and then drives up to 1,000 kilometers to where the storm will be and waits for it to develop.

　　Although anyone can do it , storm chasing is extremely dangerous. The power of a big storm can throw a cow into the air or destroy a whole house in seconds. Storm chasers are also often hurt in accidents caused by driving in a heavy rain. If you are a beginner, it is much safer to join a group for storm-chasing vacations during the storm season.

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