2. 外语
  3. Naturalists have long known that the apes, our nearest relative in the animal 【S1】______ kingdom, communicate with one and

Naturalists have long known that the apes, our nearest relative in the animal 【S1】______ kingdom, communicate with one and

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问题 Naturalists have long known that the apes, our nearest relative in the animal       【S1】______
kingdom, communicate with one and another through gestures, sounds and facial   【S2】______
expressions. But it was always thought that only human beings can use words    【S3】______
and sentences. In the 1960s, however, researchers set themselves the task of reach   【S4】______
chimpanzees to communicate with humans. At first the scientists tried make them   【S5】______
to speak. But no chimp ever managed to acquire a vocabulary of more than four words 【S6】______
and even these were spoken with great difficult. The breakthrough came when two  【S7】______
scientists from the University of Nevada decided to try America Sign Language,   【S8】______
system of gestures used by deaf people. After four years, they had taught their first 【S9】______
chimpanzees to use 132 signs correctly to communicate their wants and needs.     【S10】______
选项
答案relative→relatives
解析 此处的relatives和apes是同位语，所以应用复数形式。
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