关于小脑幕切迹疝下列哪项正确（） A.首先出现短暂的同侧瞳孔缩小 B.又称天幕疝和颞

如图所示，灯L₁、L₂上分别标有“6V 6W”、“6V 2W”的字样，当开关S闭合时，灯L₁、L₂都能发光，则甲、乙两电压表的示数之比是：

A.3∶4

B.1∶3

C.2∶3

D.1∶1

化学就在我们的身边，它与我们的生活息息相关。

（1）请用给出的化学知识点解释下列现象（只填序号）：

A．分子的体积很小；

B．分子在不断地运动；

C．分子之间有间隙；

D．不同物质的分子性质不同。①墙内开花墙外香     ；②变瘪的乒乓球放入热水中逐渐鼓起来     ；③一滴水中大约有1.67×10²¹个水分子    ；④氧气用于动植物呼吸，氮气用作保护气     。

（2）晚会时，为了让篝火更旺，常将木柴架空，目的是使木柴                       ；消防队员常用高压水枪喷出的水流将大火扑灭，其灭火原理是                    。

在下面句中横线处填入一组适当的语句，组成前后呼应的排比句。（4分）

做不了大江大河，                ；                ,就做一株小小的野草吧；做不了顶天立地的英雄，               。只要不停地奔流、生长、努力，也一样走过山高水远，                 ，也一样活得光明磊落。

孔门四科中的文学指的并不是纯文学，而是（）。

A.经史子集

B.礼乐、文献、法令等文献记载

C.指礼乐、典章、制度、文献、学术等大的方面

D.十三经及其注疏

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.

14（）

A.available

B.enough

C.sufficient

D.convenient