Mr. Long says that permits researchers to understand exactly where the fishing boats are operating. The Pew team gives the information it gathers to port officials to help them decide if they should take action against a ship. Tony Long says he would like to be able to provide port officials all over the world with clear lists. They would inform the officials about ships to inspect, ships to bar from entrance, and ships to permit entrance for trade activities.

　　The Pacific island nation of Palau was an early user of the technology. Palau has one of the richest fishing areas in the world. Last year, it announced a plan to ban commercial fishing in a 630,000 square kilometer area. K.B. Sakuma is a special adviser to the president of Palau. He says Palau is trying to deal with a recent increase in illegal, unsupervised（无人监管的）and unreported fishing.

　　“And it’s come to a head in the last year or two. From our southern island in the evening you can see on the horizon just dotted lights of these illegal fishermen that come into our waters, fill their ships with our fish, our resources, our food security...”

　　21.According to the estimation, what is the percentage of illegal fishing?

　　A. 1%

　　B. 5%

　　C. 23.5%

　　D.20%

　　22.The information is collected by the Pew team so as to ________.

　　A. leave written records for the country only

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