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
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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.
"Juggling one's life" probably means living a life characterized by______.
A. non-materialistic lifestyle
B. a bit of everything
C. extreme stress
D. anti-consumerism
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