THX家庭影院系统是（）开发研究出来的。
A、美国人
B、德国人
C、英国人
参考答案：A
用恰当的介词完成句子。
1. Please call Kate_____555-4856.
2. —Do you like to be_____ the play with Jackie Chan?
—Sure.
3. Lisa wants to work_____ a magazine when she grows up.
4. We have a job for you_____ a music teacher in our school.
5. Mike is busy_____ his work these days.
拉深时，压边力太大，制件容易起皱；压边力太小，制件容易拉裂。（）
