过敏性体质者多具有（）。A、干性皮肤 B、混合性皮肤 C、中性皮肤 D、敏感性皮肤

分解因式：2x²﹣10x=　 ▲ 　．

阅读短文，运用所学知识将符合题意的编号填入题后的空格内．

①氧气在通常状况下是无色无味的气体；②氧气不易溶于水；③在标准状况下氧气的密度为1.429g/L，比空气重；④纯氧气可用于炼钢；⑤液态氧可用于宇航；⑥氧气能与镁、铁丝、木炭等物质发生反应；⑦氧气具有氧化性．

其中属于物理性质的是______，属于化学性质的是______，属于用途的是______．

佝偻病病理生理中，"颅骨软化，出现’方颅’"属于（）

A.颅骨骨化障碍

B.机体钙、磷失调

C.肠道吸收钙、磷减少

D.骨基质不能正常钙化

E.破坏软骨细胞生长发育

数控机床能进行（）切削。

A.大功率、高速

B.小功率、高速

C.大功率、低速

D.小功率、低速

Aristotle was one of those who could found a civilization, and while he thought of education as both a social value and an end in itself, he ascribed its chief importance (21) what might be considered a third basic concept of education: to train the mind to think, (22) what it is thinking about. The key is not (23) it knows but how it (24) any new fact or argument. "An educated man," Aristotle wrote in On the Parts of Animals, "should be able to (25) a fair offhand judgment as to the goodness or badness of the method used by a professor in his exposition. To be (26) is in fact to be able to do this."
The Aristotle view of education as a (27) has become the conventionally worthy answer today (28) college presidents and other academic leaders are asked what an education should be. An educated man, says Harvard President Bok, (29) a deep breath, must have a "curiosity in (30) the unfamiliar and unexpected, an open-mindedness in entertaining opposing points of view, (31) for the ambiguity that surrounds so many important issues, and a willingness to make the best decision he can in the fact of uncertainty and doubt."
This is an approach that appears to (32) more importance to the process of learning (33) to the substance of what is learned. The very old notion of the generalist who could comprehend all subjects has (34) been an impossibility. To make matters (35) more difficult, the fields of knowledge keep changing.

A. known B. educatedC. literate D. wise