题目内容

Nowadays the Internet has become an important way of communication , _____ us to keep in contact with our friends and relatives in the distance . ?xml:namespace>

A. to permit
B. permitting
C. permitted
D. being permitting

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He has been practicing English for eight years , and now he can speak English as fluently as his English teacher _____ .?xml:namespace>

A. is
B. was
C. does
D. do

Because of the thick smog , many people move to Sanya in Hainan , believing it would be a wonderful place to _____ in .?xml:namespace>

A. live
B. living
C. be living
D. be lived

以下哪种方法不是求解线性方程组的算法( )。

A. 列主元高斯消去法
B. 矩阵直接三角分解法
C. 雅克比迭代法
D. 牛顿拉夫逊法
E. 高斯赛德尔迭代法
F. 追赶法

火灾报警控制系统一般由探测器、（）、（）、火灾显示盘、消防电话、（）、CRT显示器等组成。