问题 单项选择题

为了某种需要,现要绘制一幅代表某个国家7个省——G、I、J、L、P、S、V——的地图。G与除J之外的所有其他5个省相邻; I恰好与4个省——G、J、P、V相邻;J恰好与2个省——I和P相邻; L恰好与2个省——G和V相邻; P恰好与3个省——G、I、J相邻; S仅与G相邻; V恰好与三个省——G、I、L相邻。恰好要用6种颜色——金色、翡翠色、橄榄色、红色、银色、白色来表示这7个省,每种颜色至少使用一次,每个省在地图上仅用一种颜色,地图颜色的运用遵从以下条件:(1)相邻的省不能使用相同的颜色;(2)翡翠色和橄榄色不能相邻;(3)银色和白色不能相邻;(4)G的颜色是红色;(5)I用翡翠色。

若S是金色,则下面哪一个省一定是橄榄色

A.I

B.J

C.L

D.P

答案

参考答案:C

解析:由已知,能够是橄榄色的省一定与I不相邻,合乎此条件的只有L、s,已知s为金色,则L必然为橄榄色,所以选C

填空题
单项选择题

Our ape-men forefathers had no obvious natural weapons in the struggle for (1) in the open. They had neither the powerful teeth nor the p claws of the big cats. They could not (2) with the bear, whose strength, speed and claws (3) an impressive " small fire" weaponry. They could not even defend themselves (4) running swiftly like the horses, zebras or small animals. If the ape-men had attempted to compete on those terms in the open, they would have been (5) to failure and extinction. But they were (6) with enormous concealed advantages of a kind not possessed by any of their competitors.

In the search (7) the pickings of the forest, the ape-men had (8) efficient stereoscopic vision and a sense of color that the animals of the grasslands did not (9) . The ability to see clearly at close range permitted the ape-men to study practical problems in a way that lay far (10) the reach of the original inhabitants of the grassland. Good long-distance sight was (11) another matter. Lack of long-distance vision had not been a problem for forest-dwelling apes and monkeys because the (12) the viewpoint, the greater the range of sight-so (13) they had had to do was climb a tree. Out in the open, however, this simple solution was not (14) . Climbing a hill would have helped, but in many places the ground was flat. The ape-men (15) the only possible solution. They reared up as high as possible on their hind limbs and began to walk (16) . This vital change of physical position brought about considerable disadvantages. It was extremely unstable and it meant that the already slow ape-men became (17) still. (18) , they persevered and their bone structure gradually became (19) to the new, unstable position that (20) them the name Homo erectus, upright man.

15()

A.chose

B.adopted

C.accepted

D.took