请阅读下列短文，从每题把给的四个选项（ABC和D）中，选出最佳选项，并在答题卡上将该选项的标号涂黑。
A
Lisa was running late. Lisa, 25, had a lot to do at work, plus visitors on the way: her parents were coming in for Thanksgiving from her hometown. But as she hurried down the subway stairs, she started to feel uncomfortably warm. By the time she got to the platform, Lisa felt weak and tired--maybe it hadn’t been a good idea to give blood the night before, she thought. She rested herself against a post close to the tracks.
Several yards away, Frank, 43, and his girlfriend, Jennifer, found a spot close to where the front of the train would stop. They were deep in discussion about a house they were thinking of buying.
