阅读下面短文，掌握其大意，从每题所给的A、B、C、D四个选项中。
The passengers watched sympathetically as Susan made her way up the steps. Due to a medical misdiagnosis, she had been sightless, and she was1thrown into a world of darkness, anger and 2 And all she had to 3 was her husband, Mark, who was an Air Force officer.
When she first lost her sight, he was 4to help his wife gain the strength and confidence. Soon，Susan felt ready to return to her job, but how would she get there since she used to take the bus? So Mark volunteered to5 her to work each day，6 they worked at opposite ends of the city.7 Mark wanted Susan herself to take the bus again.
She responded, “I'm blind. I feel you're8 me.”
Mark's heart 9 hearing these words, but he promised to ride the bus with her, until Susan got the hang of it. He taught her how to rely on her other 10 to determine where she was and how to adjust to her new 11.
Finally, Susan was ready to 12 on her own. Monday 13 arrived, and for the first time they went their 14 ways. Each day on her own went perfectly.
One morning, Susan was taking the bus to work as usual when the driver said：“Madam, I do envy you.”15 she asked the driver, “Why？”
The driver answered, “Every morning for the past week, a gentleman has been watching you as you 16the bus and cross the street safely 17 you enter your office building. Then he blows you a kiss, gives you a 18 and walks away.”
Tears of 19 poured down Susan's cheeks. She was so lucky, for Mark had given her gift more 20 than sight, a gift of love that can bring light where there is darkness.
