重点讲解：
1. find out (尤指特意通过努力)发现，找出，查明；
She made it her business to find out who was responsible.
她一定要查清楚到底该谁负责a;LGsHqWp2pQ。
2. heat up 变热；
In the summer her mobile home heats up like an oven.
夏天一到，她的活动住房就变得像烤炉一样热KU9_ywRk(&LV#。
3. respond to 应对；作出回应；作出反应；
The animals were conditioned to respond to auditory stimuli.
经过训练，那些动物对声音形成了条件反射0F*tP%=bdDC[#Dgz@~a]。
4. rely on 依赖；依靠；
These days we rely heavily on computers to organize our work.
现在，我们在很大程度上依赖电脑来安排我们的工作Inq#ccu*|q|Beq8.m。