一个国家的人口( )是确定该国教育规模的基础因素。 A．数量 B．增长率 C．质

紫外线杀菌作用的机理正确的是（）

A.小剂量紫外线可以引起RNA破坏和蛋白变性

B.小剂量紫外线可以使DNA严重受损，导致细胞的死亡

C.紫外线可以破坏氨基酸，导致酶功能丧失，影响细胞的功能

D.蛋白质分解形成的组胺，会刺激组胺酶的产生，组胺酶能够分解过多的组胺

E.紫外线可以通过二羟维生素D，促进肠道对钙的吸收，进而降低血管的通透性和神经兴奋性

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．clothes

B．tools

C．foods

D．living

楼板代号“4YKB33-42d”中，“2”为（）。

A、载荷等级代号

B、板厚代号

C、板宽代号

D、板长代号

有关急性心肌梗死心肌损伤标记物的描述不正确的是（）

A.肌红蛋白起病后2小时内升高，12小时内达到高峰，24～48小时恢复正常

B.肌钙蛋白起病后6小时内升高，5～6天恢复正常

C.CK-MB起病后4小时内增高，16～24小时达高峰，3～4天恢复正常

D.AST在起病6~10小时开始升高，3～6天恢复正常

E.LDH在起病6~10小时后升高，1～2周内恢复正常

研究表明，催化剂积炭上的C/N比显著低于原料中的C/N比，说明大部分沉积物来源于含氮化合物，且主要是（）。

A、胺化物

B、普通氮化物

C、中性氮化物

D、碱性氮化物