填空题 A. known
B. idea
C. feel
Phrases:
A. but it may 1 like forever
B. a person may have no 2 what is wrong
C. what is 3 as panic disorder
A panic attack is a sudden feeling of terror. Usually it does not last long, 4 . The cause can be something as normally uneventful as driving over a bridge or flying in an airplane. And it can happen even if the person has driven over many bridges or flown many times before. A fast heartbeat. Sweaty hands. Difficulty breathing. A lightheaded feeling. At first 5 But these can all be signs of 6 . The first appearance usually is between the ages of eighteen and twenty-four. In some cases it develops after a tragedy, like the death of a loved one, or some other difficult situation.