The colorful butterflies flying through Zanzibar's Jozani Forest are beautiful to look at, but for farmers and charcoal （木炭） producers in the region, they mean something more： a paycheck. In an effort to protect the island's threatened forest, local people are being trained to raise butterflies, under a plan that tries to prevent deforestation by giving people a financial benefit.
Jozani Forest is a large woodland that is home to a group of endangered species, including the colorful red colobus monkey. But the forest is under great pressure from rapid deforestation due to charcoal production and farming.
The Zanzibar Butterfly Centre aims to change that by retraining charcoal producers in villages surrounding the forest as butterfly farmers. The program offers training and equipment to butterfly farmers, the most successful of whom can earn as much as ＄250 a month by selling butterfly pupae （蛹） to the centre own tourist exhibition and to overseas buyers. Butterfly farmers operate by catching a few female butterflies and transferring them to cages so they can lay eggs. Farmers then collect the eggs and raise the caterpillars（毛虫）by feeding them on host plants until they turn to pupae. It's at this stage that farmers start earning by selling the pupae to the butterfly centre, which sells them for export or keeps them until they hatch.
The aim of the program is to develop public awareness on the importance of protecting forests and also to give local residents extra income. Rungu Hamisi, one of the butterfly farmers who used to earn a living by making charcoal, said raising butterflies had improved his income surprisingly. "Butterfly raising is much easier than charcoal making. I get enough money to support my family," he said.



How do charcoal producers in Jozani Forest region now increase their income？ ______

A. By raising butterflies.
B. By catching rare butterflies.
C. By making and selling charcoal.
D. By protecting endangered species.

At what time do butterfly farmers start making money？ ______

A. When the butterfly eggs hatch.
B. When they catch the butterflies.
C. When the caterpillars turn to pupae.
D. When the butterflies are displayed to tourists.

Why is Rungu Hamisi mentioned in the last paragraph？ ______

A. To prove the success of the program.
B. To explain the purpose of the program.
C. To tell how local residents make a living.
D. To show the farmers interest in raising butterflies.

What is the text mainly about？ ______

A. The life of butterfly farmers.
B. The Zanzibar Butterfly Centre.
C. The importance of Jozani Forest.
D. A program to protect Jozani Forest.