—_____ your Chinese teacher very friendly?        

—Yes, _____.       [ ]

A. Are; he is

B. Is; she is

C. Are; she is

D. Are; they are

[流程图说明]
下列流程图用于从数组K中找出一切满足：K(I)+K(J)=M的元素对(K(I)，K(J))(1≤I≤J≤N)。假定数组K中的N个不同的整数已按由小到大的顺序排列，M是给定的常数。
[流程图]

此流程图中，比较“K(I)+K(J):M”最少执行次数约为 (5) 。