计算残留稳定度需要测定试件浸水( )后的马歇尔稳定度。A．24h B．48h C．3

《铁路无线通信维护暂行规则》规定，亚音频呼叫控制信号的频偏为（）KHz。

A、±0.5

B、±1

C、±1.5

D、±2

企业采购的物品大致可分为（）。

A.生产性直接原材料

B.机械设备

C.间接物料

D.行政性日常用品

对称三相电路中，三相总有功功率P=（）。

隔离开关与相应的断路器和接地刀闸之间，( )装设闭锁装置。

A．宜

B．应

C．不宜

D．不应

The amazing success of humans as a (91) is the result of the evolutionary development of our brains which has led, among other things, to tool-using, tool-making, the (92) to solve problems by logical reasoning, thoughtful cooperation, and language. One of the most striking ways in which chimpanzees biologically (93) humans (94) in structure of their brains. The chimpanzee, with the capacity for (95) reasoning, (96) a type of intelligence more like that of humans than (97) any other mammal living today. The brain of the modern chimpanzee is probably not too dissimilar (98) the brain that so many millions of years ago (99) the behavior of the first ape man.
For a long time, the fact that prehistoric people made (100) was considered to be one of the major (101) distinguishing them from other creatures. (102) pointed out earlier, I have watched chimpanzees (103) grass stems in order to use them to probe for termites. It is tree that the chimpanzee does not (104) tools to "a regular and set pattern"—but then, (105) people, before their development of stone tools, undoubtedly poked around (106) sticks, and straws, at which stage it seems (107) , that they made tools to a set pattern either.
It is because of the close (108) in most people’s minds of tools with humans (109) special attention has always been focused upon any animal able to use an object as a tool: but it is important to realize that this ability, on its own, does not necessarily indicate any special intelligence in the creature (110) .

A．competence

B．ability

C．quality

D．skill