单项选择题

Animals (36) with each other in (37) ways. Some insects such as ants (38) smell to tell other ants, "There’s food over there. " Bees communicate by sight. They (39) a kind of dance to tell other bees the (40) of a supply of flowers. Many mammals(哺乳动物) such as elephants and whales (41) information by (42) . A (43) whale can (44) another whale 1,200 km away! We humans use (45) . Many people (46) , "Do animals use language, too Can humans and animals communicate with each other"
(47) the 1960s and 1970s, two teachers at the University of Nevada, Beatrix and R. Allen Gardener, (48) American Sign Language (ASL) to young chimpanzees (猩猩). They (49) their first chimpanzee Washoe. (50) age five Washoe knew and used more than 160 signs. With these words, she communicated with (51) . She also (52) herself and other animals. Washoe and (53) chimpanzees often put signs together to (54) a new word. "Metal hot" (55) a cigarette lighter, for example.

49（）

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