已知函数f（x）=logax-2x+2（a＞0，且a≠1）．（1）求f（x）的定

When I was growing up, I was embarrassed to be seen with my father. He (1) severely crippled and very short, and when we would walk together, his hand on my arm (2) balance, people would stare. I would inwardly be afraid (3) squirm at the unwanted attention. If he ever noticed or was bothered, he never let (4) .
It was difficult to coordinate (5) steps - his halting, mine impatient - and because of that, we didn’t say much as we went along. But as we started out, he always said, "You (6) the pace. I will try to adjust to you. "
Our usual walk was to or (7) the subway, which was how he got to (8) . He went to work sick, and (9) nasty weather. He almost never missed a day, and would (10) it to the office even if (11) could not: a matter of pride!
He never talked about himself as an object of pity, (12) did he show any envy of the more fortunate or able. What he looked for in others was a "good heart", and if he found one, the owner was good enough for him.
Now that I am older, I believe that is a proper standard (13) which to judge people, even though I still don’t know precisely (14) a "good heart" is. But I know the times I don’t have one myself.
He has (15) gone many years now, but I think (16) him often. I wonder if he sensed my reluctance to be seen with him during our (17) . If he did, I am (18) I never told him how sorry I was, how unworthy I was, how I regretted it. I think of him when I complain about trifles, when I am (19) of another’s good fortune, when I don’t have a "good heart".
At such times I put my hand on his arm to regain my (20) , and say, "You set the pace, I will try to adjust to you.\

内源性铁主要来自

A．白细胞

B．衰老和破坏的红细胞

C．血小板

D．嗜酸细胞

E．嗜碱细胞

【说明】
某局域网采用基于Windows Server 2003操作系统的DHCP服务器自动分配IP地址，其网络拓扑结构如图2-6所示。DHCP服务器分配的地址范围如图2-7所示。

【问题2】
图2-8是DHCP服务器安装中的“添加排除”窗口。

参照图2-6和图2-7，为图2-8中配置相关信息。
起始IP地址： (3) ； 结束IP地址： (4) 。

拉丁美洲的总面积比整个欧洲加上美国的总和还要大。