第5题: [单项选择]The two psychologists had to modify the American Sign Language somewhat in order to accommodate the chimpanzees' spontaneous gestures. A. change B. abort C. shorten D. enhance 参考答案:A 答案解析:change改变,变化,转变;abort异常中断,中途夭折;shorten缩短;enhance提高,增强; modify修改,更改。