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6．是“函數的最小正周期為”的____________條件．

5.編寫程序求S=1+2+3+4+…+n的和(n由鍵盤輸入),程序如下.在如下程序的橫線上應填________.　　　　　　　　　　

4．一個四邊形的四個內角成等差數列，最小角為，則最大角為________.　

3．函數在=1處的導數等于_________.　　　　

2．已知向量，若與共線，則等于______.　 　　 　　　

1．設全集U = R ，A =，則=_________.

80. We are interested in the weather because it _____ us so directly ------ what we wear, what we do, and even how we feel.

　 A. benefits　　 B. guides　　 C. affects　　 D. effects

　C. affects.

　 affect (=have an influence or effect on) 影響：The climate affected his health. (氣候影響[損害]了他的健康。)

[注意]affect vt. 影響。effect n. (=influent) 影響, 作用：Some films have a misleading effect on children. effect vt. (=bring about) 實行, 進行, 產生......后果:1) I will effect my purpose: no-one shall stop me! 2) We hope to effect an improvement. (我們希望能引起改進。)

注意兩個常用的習語:1) to that effect 那個意思的 (話) ：She said she hated spinach, or words to that effect. (她說她不喜歡吃菠菜或那個意思的話。) 2) to the effect that... 意思時說, 表示下述意思：I said a few words the effect that all he had told us was already well known. (我說了幾句話, 意思是說他告訴我們的一切都已眾所周知。

79. An early typewriter produced letters quickly and neatly; the typist, _____ couldn't see his work on his machine.

　 A. however　　 B. therefore　　 C. yet　　 D. although

　A. however.　

　　 however 然而。

本題譯文：早期的打字機打起字來又快又整齊, 然而打字員不能看著機器鍵盤打字。

78. The reason why he adapted to the new situations quickly is that he has a _____ attitude.

　 A. changeable　　 B. alternate　　 C. movable　　 D. flexible

　D. flexible.

　　 flexible 靈活的, 可變通的; We need a foreign policy that is more flexible.

77. Motorists _____ of speeding may be banned from driving for a year.

　 A. convicted　　 B. arrested　　 C. charged　　 D. judged

　A. convicted.

be convicted to 被判有...... (罪) ：He was convicted of murder. (他被法院判有謀殺罪。)