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问题 单项选择题

下列关于图遍历的说法不正确的是（）。

A.连通图的深度优先搜索是一个递归过程

B.图的广度优先搜索中邻接点的寻找具有“先进先出”的特征

C.非连通图不能用深度优先搜索法

D.图的遍历要求每一顶点仅被访问一次

答案

参考答案：C

多项选择题

胰头癌的临床表现有（）

A.逐渐加重的黄疸

B.腹腔深部疼痛

C.血清中淀粉酶增高

D.脾大、腹腔积液

E.癌转移至胰头旁及胆总管旁淋巴结
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单项选择题

It was a very hot day in the middle of summer, and there were no trees along the street. Mr. Read (41) his shop at half past five, and went out into the street and began walking to the bus. He was a very (42) man. The sun shone straight down the street, and in a few minutes Mr. Read (43) very hot.

A. pleasedB. OK C. sorry

A small boy came out of another (44) in the street and followed Mr. Read. He stayed very (45) him all the time, and he kicked Mr. Read’s (46) several times. Mr. Read looked at him angrily each time.After the fourth time, Mr. Read stopped, turned (47) and said to the small boy, "What are you doing (48) following me like that! You’re going to hurt my feet."
"I’m (49) , but don’t stop me, please!" the small boy said. "It’s very hot today, and there isn’t (50) shade anywhere else in the street!\
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