This book included several readings about language and communication. One discussion was about the different communication systems among animals. ＿＿（46）＿＿ passage discussed the methods some scientists are using to teach human language to animals. We know, of course, that human language itself ＿＿（47）＿＿ many forms. ＿＿（48）＿＿ language is not the same as spoken language. Some communication systems ＿＿（49）＿＿ the Morse Code or American Sign Languages use audible signals or hand gestures to communicate. There are hundreds of different languages used in different areas of the world. And now, ＿＿（50）＿＿ Deborah Tannen, there seem to be important differences between the languages of men and women.