四冲程发动机的四个冲程为：进气冲程、（）、作功冲程、排气冲程。四冲程发动机的实际循环由进气、压缩、燃烧、（）、和排气五个过程组成。
参考答案：压缩；膨胀
--- Have the police broken the case?
---Yes, five men, including a pair of twins, have admitted robbery at the store, but _______ murder.
A．denied
B．refused
C．rejected
D．declined
The manager is always very _______ for appointments, which earns him a good reputation.
A．punctual
B．numb
C．allergic
D．content
