In Wiltshire， England， volunteers are being searched for to visit a nature protection area to count the butterflies living there and in nearby fields． The project is started by an environmental protection organization， which has been devoted to improving the living environment for wild animals． Recently， the organization has issued an appeal（呼吁）to help it observe environmental changes based on the record of butterflies and protect the environment．
In the area， the local people have planted many special flowers with the help of the organization． They want to see whether these flowers will interest the rare and beautiful butterflies． The project officer Sarah Marshall says， "It will be a suitable habitat for butterflies． They are great ‘indicator species" as they are easily affected by climate changes． So they make a brilliant early-warning system for the environment．"
She also points out that volunteers are needed to record the number or species of butterflies， and based on the change happening to the butterflies， the hidden environmental problems in the area can be found out in time．
The organization is searching for volunteers to help monitor （监测） butterflies from April through to September． They will walk a fixed route and record the different butterflies they meet along the way． Each visit should take no more than two hours， and each volunteer is expected to visit once a month to count the wildlife． "Staff will provide backup （后备人员）， so if the weather is poor on the day you are to visit （butterflies don't like to fly in the rain， wind or if it's too cloudy） we can have someone else do your job，" Sarah points out．
No previous experience is necessary as training and support will be provided， but a strong interest is essential． If you are interested， please contact Sarah on （01380）725670， ext 278， or email sarahm@wiltshirewildlife．org．



Why are special flowers planted in the nature protection area？ ______

A. To attract visitors．
B. To attract butterflies．
C. To improve the environment．
D. To help the local people make money．

According to Sarah Marshall， butterflies are ______ ．

A. reducing in number in Wiltshire
B. particular about their habitat
C. unable to keep up with climate changes
D. sensitive to environmental changes

According to the text， a volunteer ______ ．

A. will take a different route each time
B. must know a lot about butterflies
C. will visit the area 6times in total
D. must have previous experience

What is the purpose of the text？ ______

A. To persuade people to visit Wiltshire．
B. To advertise for volunteers with a project．
C. To encourage people to protect butterflies．
D. To show a way to indicate climate change．