Airplanes have the reputation of being dangerous and expensive. But nothing can match them for speed and comfort. Traveling at a height of 30,000 feet, far above the clouds, and at over 500 miles an hour is an exhilarating experience. For a few hours, you settle back in a deep armchair to enjoy the flight. The real escapist can watch a free film show and sip champagne on some services. But even when such refinements are not available, there is plenty to keep you occupied. An airplane offers you an unusual and breathtaking view of the world. You soar effortlessly over high mountains and deep valleys. You really see the shape of the land. If the landscape is hidden from the view, you can enjoy the extraordinary, sight of unbroken cloud plains that stretch out for miles before you, while the sun shines brilliantly in a clear sky. The journey is so smooth that there is nothing to prevent you from reading or sleeping. However you decide to spend your time, one thing is certain: you will arrive at your destination fresh and unctrumpled.
The author indicates that reading can help lessen ______.

A. the boredom of being in the train
B. the tiresome clicking of the wheels
C. the sleeplessness during the journey
D. the poor ventilation of the compartment