1. Arouse readers’ interest in reading; introduce the most obvious feature of the cicada—singing.

2. It usually sits side by side with its companions and does not need to shout.

3. Because there are huge soundboards in the body, the vital organs have no place to be placed, so they have to be squeezed into the smallest corner of the body.

4. Incorrect. The ideas put forward by the author have been tested many times.