The researchers have shown that the common belief that the great white can be found throughout the oceans is mistaken.Instead，this large fish has failed to mix with other populations“for tens of thousands of years.”Other studies have shown that individual fish may enter the hunting areas of other populations for short periods，and then return.

　　The animal protectors realize that this information is either good or bad.Researchers have an easy insight into the life of the resident shark population.That the numbers are limited and no population comes from the outside makes researchers more worrying.This makes it especially unlikely that there has been a mistake in the count.Great white sharks falling victim to trawlers(拖网船)，sports fishing，and poaching(偷捕)may also be reasons for the decline，along with a decline in food stocks due to pollution or overfishing.At the same time，of course，people who are afraid of going swimming off California’s beaches because of the sharks will have mixed feelings about their decline.

　　5．From the text we can learn that______.

　　A．the great white shark is facing extinction

　　B．great white sharks are spreading throughout the oceans

　　C．great white sharks rarely attack human beings

　　D．measures have been taken to protect the great white shark

　　6．The underlined word“predator”in Paragraph 3 probably means“______”．

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