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问题 解答题

已知一个正比例函数和一个一次函数，它们的图象都经过点P（﹣3，3），且一次函数的图象与y轴相交于点Q（0，﹣2），求这两个函数解析式．

答案

解：设正比例函数解析式为y=k1x，

∵它经过点P（﹣3，3），

∴﹣3k1=3，

解得k1=﹣1，

∴正比例函数解析式为y=﹣x；

设一次函数解析式为y=k2+b，

∵它经过点P（﹣3，3），点Q（0，﹣2），

∴，

解得，

所以一次函数解析式为y=﹣x﹣2．

故答案为：y=﹣x；y=﹣x﹣2．

单项选择题

以下选项中不能作为C语言合法常量的是

A．'cd'

B．0.1e+6

C．\a

D．'\011'
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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.

5（）

A.driven

B.doomed

C.forced

D.led
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