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问题 单项选择题 A型题

外周血涂片发现大量原始细胞，提示为下列哪种疾病（）

A.慢性白血病

B.类白血病反应

C.急性白血病

D.再生障碍性贫血

E.原发性血小板减少性紫癜

答案

参考答案：C

单项选择题

下面是关于树和线性结构的描述：

线性结构存在惟一的没有前驱的 (18) ，树存在惟一的没有前驱的 (19) ：线性结构存在惟一的没有后继的 (20) ，树存在多个没有后继的 (21) ；线性结构其余元素均存在 (22) ，树其余结点均存在 (23) 。

由此可见，由于线性结构是一个 (24) 结构，元素之间存在的是 (25) 的关系，而树是一个 (26) 结构，元素之间存在的是 (27) 的关系。

（19）处填（）。

A．根结点

B．首元素

C．尾元素

D．叶子
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补全对话，情景问答
根据对话内容，从对话前的选项中选出能填入空白处的最佳选项，并在答题卡上将该项涂黑。选项中有一项为多余选项。
A. In fact tourism is our main industry (产业).
B. I see it must be very cold in winter.
C. Do you like visiting museums?
D. And is it a very big town?
E. Many of the houses were built in the 17 th century.
F. And what about museums?
A: Could you tell me something about your hometown? People say it's quite near the sea.
B: Oh, no. My hometown is about 100 miles from the sea.
A: Oh, I see.  1  
B: Not really. It's got a population of about 20,000.
A: And is it a very old town?
B: Yes, it is.   2   
A: Really? It must be quite an interesting place then.
B: Yes, it is. We get a lot of tourists.  3  
A: Well, what do the tourists do there?
B: Oh, the can walk through the town and look at the old buildings. There are some great restaurants in the town.
A:   4  
B: No, there isn't any. But there are a few lovely mountains near the town. They are very good for skiing in winter.
A:   5  
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