3 . A rabbit is running into its hole. You will ask, “What has this to do _________ language?” Well, when a rabbit sees something _________, it runs away. Its _________ moves up and down as it runs. When other rabbits see this, they run too. They know that there is _________. The rabbit has told them something _________ making a sound. It has given them a _________.

Many _________ animals use this kind of language. When a bee _________ some food, it goes back to its home. It cannot tell the other bees _________ the food is by speaking to them, __________ it does a little dance in the air. This tells the bees where the food is.

Some animals say things __________. A dog barks (吠叫), for instance, when __________ comes near. A cat purrs (叫) when __________. Some birds make several different sounds, each __________ its own meaning.

But human beings have something that no animal has — a large number of words which have the meanings of things, actions, feelings or ideas. We are able to give each other information, to tell or inform (告诉) other people __________ we think or how we feel. By writing words down we can remind ourselves of the things that have happened, or send messages to people far away. No animals can do this.

No one knows how man learned to make words. Somehow (然而) he learned to make them. As centuries went by, he made more and more new words.

4 . Smartwatches and fitness trackers (健身追踪器) have gained popularity recently. These tools can record your daily steps, heart rates, etc.     1    . If yes, it might be a sign that you’re addicted to your fitness tracker.

    2    . If you keep setting unrealistic daily goals that involve working out for too long, and if you begin to ignore friends and responsibilities to make time for your workout, then you’re most probably addicted to your fitness tracker.

It’s a struggle to overcome the addiction to fitness trackers.     3    . For example, the number in your smart watch showing how far you’ve come can give you a sense of achievement.

Of course, failing to meet your daily goal can be discouraging. You might focus on your shortcoming rather than your progress. Another problem is that you might find yourself paying too much attention to the step number rather than how your body feels.     4    .

Therefore, if you’re spending too much time looking at your smartwatch, limit your daily step count to a comfortable level.     5    . For example, concentrating on your hobbies or socializing with friends can be a great way to keep your mind on other things.