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问题 选择题

以下生物体结构最简单的是

A．细菌

B．植物

C．动物

D．病毒

答案

答案：D

题目分析: 病毒结构简单无细胞结构。只有由蛋白质组成的外壳和内部的遗传物质组成。

考点: 构成生物体结构和功能的基本单位是细胞。

改错题

第二卷

第四部分写作（共两节，满分35分）

第一节   短文改错(共10小题；每小题1分，满份10分)

假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10初语言错误，每句中最多有两处。对标有题号的每一行作出判断：如无错误，在该行右边横线上画一个勾（√）如有错误（每行只有一个错误），则按下列情况改正：

删除：把多余的词用斜线(\)划掉，在该行右边横线上写出该词，并也用斜线划掉。

增加：在缺词处加一个漏字符合(^)，在该行右边横线上写出该加的词。

修改：在错的词下划—横线，在该行右边横线上写出改正后的词。

注意：1.每处错误及其修改均仅限一词；

2.至允许修改10处，多者（从第11处起）不计分。

Christine was just a girl in one of my class. I never knew much about her except for that she was strang . she didn’t talk many .her hair was black and purple, and she worn black sports shoes and a black sweater ,although  in the summer .she was ,infact, rather attractively, and she never seemed care what the rest if us thought about  her .like the rest of my classmate ,I didn’t really want to get closest to her . it was only when we did their chemistry projiect together that I  begin to uanderstand why christine  dressed the way she did .
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单项选择题

Networks can be interconnected by different devices. In the physical layer, networks can be connected by (41) or hubs, which just move the bits from one network to an identical network. One layer up we find bridges and switches, which operate at data link layer. They can accept (42) , examine the MAC address, and forward the frames to a different network while doing minor protocol translation in the process. In the network layer, we have routers that can connect two networks. If two networks have (43) network layer, the router may be able to translate between the packet formats. In the transport layer we find transport gateway, which can interface between two transport connections. Finally, in the application layer, application gateways translate message (44) . As an example, gateways between Internet E-mail and X.400 E-mail must (45) the E-mail message and change various header fields.

A．analyze

B．parse

C．delete

D．create
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