155.
M: Where's Joan? She said she would be here at 3, but now it's 3:30. She must have missed the train.
W: I think so. I hope she doesn't miss the next one, otherwise she'll be late for the opening address at the conference.
答案解析：
正确答案为B。根据she'll be late for the opening address她可能会错过开幕陈词。可知，女子担心琼错过开幕演讲，因此B项正确。

156.
M: This has been the worst flood in the past 20 years. It has caused much damage and destruction.
W: Look at the prices of fruits and vegetables. No wonder they are so expensive.
答案解析：
正确答案为C。根据女子说It has caused much damage and destruction.洪水造成了巨大损失和破坏。以及男子说Look at the prices of fruits and vegetables. No wonder they are so expensive.看看水果和蔬菜的价格，怪不得那么贵呢。可知，二人在谈论洪水带来的影响，因此C项正确。