若对n阶对称矩阵A[1．．n，1．．n]以行序为主序方式下将其下三角的元素(包括主对角线上的所有元素)依次存放于一维数组B[1．．n(n+1)／2]中，则在B中确定aij(i
A. i(i-1)／2+j
B. j(j一1)／2+i
C. i(i+1)／2+j
D. j(j+1)／2+i
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索化二叉树中，t所指结点没有左子树的充要条件是()。
A. t-＞left=NULL
B. t-＞ltag=1
C. t-＞ltag=1且t-＞left=NULL
D. 以上都不对
What is the main idea of the passage？
A. Green bananas are very useful fruit.
B. People living in small villages are usually very kind.
C. People should go out to see the whole world very often.
D. One should understand the world from different perspectiv
Which of the following is palatal affricate？
A. [dV]
B. [F]
C. [V]
Which of the following is true with disapproved drugs？
A. There is nothing to prove that such drugs are not safe.
B. It is affirmative that such drugs are ineffective and dangerous.
C. Physicians do not intend to use such drugs.
D. Such drugs have never been tested by FDA.
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