短文填空

    Did you hear about Zhao Xiaoting? She wasa college student in Wuhan. When she was incollege, she did well in all her subjects. And shewas s   1   to find a good job in big cities. Butin July 2010, she went to Guizhou to teach as av   2   . Her parents were very m   3    at herbecause of this.    

    When she got to a rural v   4   , she foundit was very p   5   .But she felt very l   6 _because people there were very friendly. Thenshe stayed there and taught the kids English, dancing and so on. People there loved her verymuch.    

    Most of the roads in Guizhou are throughthe mountains. Sometimes they were in d    7   while they were walking on the road. On July21th, 2010,  a big stone fell down from themountain and hit Zhao on the head when shewas walking on the road. It made her die.   Her death gave a great i    8   to thecollege students. They made a d    9   to go onteaching in these a   10   and help those poorchildren.

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一办公楼现时总预售价为2000万元，某投资者预付200万元订购了该楼宇，一年后竣工交付使用时楼价上涨了15%，则该投资者预付款的收益率为（）。

A．50%

B．150%

C．135%

D．25%