In some cases biological control helps to solve the exotic species problems. It is the science of controlling one invader with another. In the early 1900s, several exotic predators(肉食动物） were imported to Hawaii to eat a harmful exotic pest called the sugarcane leafhopper. The insect was destroying 70,000 tons of sugar a year ，but the predators brought it under control.

　　The efforts of these scientists and other people are vitally important. In Hawaii alone，10，000 different species of native plants and animals still need to be protected. Many of these are found nowhere else on earth. By stopping the spread of the biological invaders, we not only protect ourselves, but we also protect the many other native species that make our planet such a special place to live.

　　63. This passage is mainly about

　　______.

　　A. the methods for preventing exotic species

　　B. the effects of exotic invasion on Hawaii

　　C. the problems faced by the Hawaiian economy

　　D. the role of biologists in controlling native species

　　64. Hawaii is at a great risk of invasion by exotic species, because ______.

　　A. many agriculture products grow there

　　B. regular inspections of animals are useless

　　C. millions of people go to Hawaii each year

　　D. biological control efforts have not worked

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