C．make ourselves relaxed

　　D．give ourselves amusement

　　4．The author would probably hold the view that______.

　　A．encouraging words are sure to lead to kind offers

　　B．negative words may encourage us to make more progress

　　C．people tend to remember friendly words

　　D．it is better to think twice before talking to others

　　B

　　A different kind of census(数量普查)，involving the great white shark，recently took place off California’s central coast.The result is worrying：only an estimated 219 great white sharks are currently in the waters off the California coastline.

　　Stanford University researchers，after a count of the great white shark population，have discovered that it is falling in the northeastern Pacific Ocean.The waters off the central California coast are well known as habitats for the sharks，along with the coasts of Australia，New Zealand，and South Africa.

　　The great white shark，regarded as a“man eater”，is well known for its size，with the largest individuals known to have approached over 6 meters in length，and 2,268 kilograms in weight.It can have a life span of over 30 years.The predator，feeding on other animals in the ocean，has existed for about 400 million years，but is considered in danger of extinction.According to the Stanford researchers，some groups of the great white sharks have declined by between 70 and 90 percent.

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