81. [答案]正确

80. [答案]exist → exists。 主语a park是单数第三人称。

79. [答案]were → are。 根据上文可知饭店和鱼店消失都陈述的是现在的情况。

78. [答案]older → old。句中没有比较的意思。

77. [答案] living → live。used to 后跟动词原形，表示“过去常常做某事请”。

　After five years away in my hometown, I find that　　　　　　 76. ________________

　The neighborhood which I used to living in has changed　　 77.________________

　a lot. The Sichuan Restaurant and the older fish shop　　　 78 ._______________

　across the street from our middle school were gone.　　　　 79.________________

　There exist now a park that has a small river running　　　 80.________________

　through. The factory at the comer of Friendship Street and　 81. _______________

　Zhongshan Road has been moved out of the city, and sports　 82. ______________

　center has been built in their place. The market at the corner of 83. _____________

　Friendship Street and Xinhua Road has been given way to　　　 84. ________________

　a supermarket. Besides the bookstore next to our middle　　 85. _______________

　school is still there.

　[解析]

76. [答案]in→from。句意是我离开家乡五年，away from属于固定搭配。

我们称A₁,A₂,…,A_n为集合A的一个n分划，如果

(1)；

(2)，1≤i＜j≤n．

求最小正整数m，使得对A＝{1,2,…,m}的任意一个13分划A₁,A₂,…,A₁₃，一定存在某个集合A_i­(1≤i≤13)，在A_i中有两个元素a、b满足b＜a≤b．

给定由正整数组成的数列

(n≥1)．

(1)求证：数列相邻项组成的无穷个整点

(a₁,a₂)，(a₃,a₄)，…，(a_2k-1,a_2k)，…

均在曲线x²+xy-y²+1=0上．

(2)若设f(x)=xⁿ+x^n-1-a_nx-a_n-1，g(x)=x²-x-1，证明：g(x)整除f(x)．

设ABCD是面积为2的长方形，P为边CD上的一点，Q为△PAB的内切圆与边AB的切点．乘积PA·PB的值随着长方形ABCD及点P的变化而变化，当PA·PB取最小值时，

(1)证明：AB≥2BC；

(2)求AQ·BQ的值．

对正实数a、b、c．求证：

≥9．

第二试