Most people agree that trees look nice. But not too many people know trees can also help us save money. Environmental scientists did some research and they learned that just one tree can save a city about 2,800 yuan over the tree's lifetime.
One way trees save money is by helping us save energy. Big trees stop the summer sun from shining directly to the buildings. Big trees block(遮挡) the winter wind. In this way, they help people to save the energy to make their homes and offices cool or warm. Saving energy means saving money!
()The underlined word “they” refers to “”.

A.city cleaners
B.environmental scientists
C.big trees
D.tall buildings
【答案】C 解析:本题可采用“就近指代法”。根据“Big trees stop the summer sun from shining directly to the buildings. Big trees block(遮挡) the winter wind.”(大树阻挡了夏日阳光直射到建筑物上。大树遮挡冬天的风。)可知,画线代词所在句是说“通过这种方式,大树帮助人们节省能源,使他们的家和办公室凉爽或温暖”,即代词 they 指代前文提到的 big trees。故选 C。

C

采用就近指代法，定位划线单词前的内容“Big trees stop the summer sun from shining directly to the buildings. Big trees block the winter wind.”，可知they指代前文提到的big trees。