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问题 填空题

如果在一周内安排三所学校的学生参观某展览馆，每天最多只安排一所学校，要求甲学校连续参观两天，其余两所学校均只参观一天，那么不同的安排方法共有______种．

答案

分两步完成，第一步先安排甲学校参观，共六种安排方法；第二步安排另外两所学校，共有A52安排方法，

故不同的安排种法有6×A52=120，

故答案为120．

单项选择题

In June 1985, two British mountaineers Joe Simpson and Simon Yates made the first-ever climb of the 21,000-foot snow-covered Siula Grande mountain in Peru. It was an exceptionally (26) job, but nothing compared to what was to (27) . Early in the process, Simpson (28) and broke his right knee. Yates could have (29) him but managed to find a way of (30) him down the mountains on a rope in a series of difficult drops. Then Simpson fell into a crevasse and Yates eventually had no (31) but to cut the (32) , completely convinced that his friend was now (33)

In his book on the (34) , Joe Simpson wrote:

(35) I looked at the distant moraines, I know that I must at least try I would probably (36) there among those rocks. If I died, well, that wasn’t so (37) , but I wouldn’t have (38) waited for it to happen. The (39) of dying no longer affected me as it had in the crevasse at first. I now had a chance to (40) it and struggle against it.

The survival of Yates himself was (41) . That Simpson somehow found a way of (42) out of the crevasse after 12 hours and then crawled and (43) himself six miles back to camp, (44) three days and might without food or drink, would be considered as a heroic fiction. But in fact it was so (45) .

27（）

A.be came 

B.end 

C.come 

D.change
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单项选择题

下列选项中，关于背板能力的说法不正确的是( )。

A．背板能力决定了路由器的吞吐量
B．传统的路由器采用的是交换机结构
C．背板能力是路由器关键技术指标之一
D．背板是路由器输入端与输出端之间的物理通道
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