B.

   In Tokyo, a company invented a device called the Bow-Lingual. This device can translate a dog’s bark into (21)_____. The Bow-Lingual is becoming very popular. In fact, now you can buy one in different languages all over the world!     Rico, a nine-year-old dog in Germany, knew the names of over 200 toys. In an experiment, the researchers put a new toy together (22)_____ seven of Rico’s old toys in a room. Then they told Rico to get the new toy, (23)_____ that toy by its new name. Rico understood the order and finished the task 7 out of ten times. One month later, Rico remembered the name of the new toy. (24)_____, according to the researchers, a dog can hear and new words (25)_____ a child.
【題組】21