缩略词语在产品说明书中十分常见，以下哪些是缩略语？（）
A. NET WT
B. ROM
C. BASIC
D. American Airlines
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商务信函通常用词礼貌，以下哪一项没有体现用词礼貌特征？（）
A. We will appreciate it if you replace the damaged bearings
B. We have not received your payment of the balance of US＄5, 000
C. It is with pleasure that we have reached an agreement on all the terms
D. We shall be glad to fill your order as soon as we receive your check
公示语“小草微微笑，请您走便道2 分）（）
A. Please keep off the grass
B. Little grass is smiling slightly，please walk on the pavement
C. Little grass has life，please watch your step
D. Protect a piece of green leaf and dedicate a share of love
Which of the following explains Jimmy, the policeman in After Twenty Years, would not arrest his friend in person（）
A. He didn’t recognize the person as a criminal wanted
B. He felt ashamed to arrest his friend
C. He was not feeling good to arrest his once best friend in person
D. He felt scared to arrest his friend
Which of the following is the main cause of the nonlinear effect of optical fiber（）
A. Fiber ovality
B. Input power of the optical signal
C. Fiber bending
D. Fiber length
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