阅读理解 Passage Three New research suggests that animals have a much higher level of brainpower than previously thought. If animals do have intelligence, how do scientists measure it ? Before defining animals’ intelligence, scientists defined what is not intelligence . Instinct is not intelligence. It is a skill programmed into an animal’s brain . Rote conditioning is also not intelligence. Tricks can be learned by repetition, but no real thinking is involved . Scientists believe that insight(顿悟) the ability to use tools , and communication using human language are all effective measures of the mental ability of animals. Scientists define insight as a flash of sudden understanding . When a young gorilla could not reach fruit from a tree , she noticed some boxes scattered about the lawn near the tree . She piled up the boxes , then climbed on them to reach her reward . The gorilla’s insight allowed her to solve a new problem without trial and error. The ability to use tools is also an important sign of intelligence . Crows use sticks to get nuts out of cracks . The crow exhibits intelligence by showing it has learned what a stick can do . Likewise , seals use rocks to crack open shells in order to get at the meat. Many animals have learned to communicate using human language . One chimp can recognize and correctly use more than 250 abstract symbols on a keyboard . These symbols represent human words. An amazing parrot can distinguish five objects of two different types . He can understand the difference between the number , color , and kind of object . The ability to classify is a basic thinking skill. He seems to use language to express his needs and emotions . When ill and taken to the animal hospital for his first overnight stay , this parrot turned to go . “Come here!” he cried to a scientist who works with him . “I love you . I’m sorry. Wanna go back?” The research on animal intelligence raises important questions . If animals are smarter than once thought , would that change the way humans interact with them? Would humans stop hunting them for sport or survival? Would animals still be used for food , clothing , or medical experimentation? Finding the answer to these tough questions makes a difficult puzzle even for a large-brained, problem-solving species like our own.

单选题 As is mentioned in Paragraph 1 , “tricks” played by animals may be ________.

单选题 Crows’ using sticks to get nuts out of cracks illustrates_________.

单选题 The parrot’s being able to distinguish five objects of two different types indicates ______.

单选题 Which of the following is an example of animals’ communication through the use of human language?

单选题 The last paragraph implies that __________.