【正确答案】 C

【答案解析】abrupt：突然的。Following all abrupt change of the topic, we started to complain about the quality of food. 话题突然一转，我们开始抱怨饭菜的质量。sudden与abrupt的意思近似：突然的。slow：慢。noisy：吵人的。jumpy：跳动的；神经过敏的。She seemed very jumpy recently. 她最近情绪很不稳定。