阅读下面短文,从短文后所给的A.B.C和D四个选项中选出能填人空白处的最佳选项,并在答题卡上将该项涂黑。 Animals 1 with each other in 2 ways. Some insects such as ants ” 3 smell to tell other ants,"There's food over there. ”Bees communicate by sight. They 4 a kind of dance to tell other bees the 5 of a supply of flowers. Mary mammals(哺乳动物) such as elephants and whales 6 information by 7 . A 8 whale can 9 another whale1 ,200 km away! We humans use 10 . Many people 11 ,“Do animals use language,too? Can humans and animals communicate with each other?" 12 the 1960s and 1970s, two teachers at the University of Nevada, Beatrix and R.Allen Gardener, 13 American Sign Language ( ASL) to young chimpanzees( 猩猩). They 14 their first chimpanzee Washoe. 15 age five Washoe knew and used more than 160 signs. With these words, she communicated with 16 . She also 17 herself and other animals. Washoe and 18 chimpanzees often put signs together to 19 a new word.“Metal hot” 20 a cigarette lighter, for example.