第一部分：阅读理解（共两节，满分40分）
第一节（共15小题；每小题2分，满分30分）
阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项，并在答题卡上将该项涂黑。
A
All around the world, an increasing number of people are spending their time taking part in online volunteering projects. What encourages them to help strangers without expectation of money or even thanks?
