问题 单项选择题

TCP functions at the Open System Interconnection (OSI) (61) layer, or Layer 4. Its chief responsibility is to ensure (62) end-to-end connectivity. IP, located one layer down, at the OSI network layer, or Layer 3, communicates the addresses of each (63) sender and receiver to the routers along the way. Routers and Layer 3 switches can read IP and other Layer 3 (64) . This information, combined with routing tables and other network intelligence, is all it takes to get (65) the room or around the world via TCP/IP.

A.across

B.up

C.off

D.rid

答案

参考答案:A

解析:[译文] TCP在开放系统互联(OSI)的传输层或第四层起作用,其主要功能是确保可靠的端对端的连接。位于下一层的IP在OSI的网络层或第三层,把每个分组的发送者和接收者的地址沿着路线传送给路由器。路由器和第三层交换机可以读IP和其他第三层协议。这些信息与路由表和其他网络智能结合在一起,就是它通过TCP/IP能跨越空间,周游世界。

[分析]: 本题考察的是ISOOSI模型的第三层和第四层的简单功能问题,只要熟悉该模型,问题就变得十分简单了。
本题C小题空的前面有each,后面只能接单数,所以,②packets和④ packets’ 肯定不对。同时,所缺单词作为sender and receiver 的定语,因此,正确答案是packet’s。

单项选择题
单项选择题

Abortion. The word alone causes civil conversation to flee the room. This is largely because the pro-choice and pro-life positions are being defined by their extremes, by those who scream accusations instead of arguments.

More reasonable voices and concerns, on both sides of the fence, are given little attention.

For example, pro-life extremists seem unwilling to draw distinctions between some abortions and others, such as those resulting from rape with an underage child. They would make no exception in the recent real-life case of a woman who discovered in her fifth month that her baby would be born dead due to severe disabilities.

On the other hand, pro-choice extremists within feminism insist on holding inconsistent positions. The pregnant woman has an unquestionable fight to abort, they claim. Yet if the biological father has no say whatsoever over the woman’s choice, is it reasonable to impose legal obligations upon him for child support Can absolute legal obligation adhere without some sort of corresponding legal rights

The only hope for progress in the abortion dialogue lies in the great excluded middle, in the voices of average people who see something wrong with a young girl forced to bear the baby of a rapist.

Any commentary on abortion should include a statement of the writer’s position. I represent what seems to be a growing "middle ground" in pro-choice opinion. Legally, I believe in the right of every human being to medically control everything under his or her own skin. Many things people have a legal right to do, however, seem clearly wrong to me. adultery, lying to friends, walking past someone who is bleeding on the street. Some forms of abortion fall into that category. Morally speaking, my doubts have become so extreme that I could not undergo the procedure past the first three months and I would attempt to dissuade friends from doing so.

Fanatics on both sides are using reprehensible and deceitful tactics. An honest dialogue on abortion must start by re-setting the stage, by denouncing the approaches that block communication.

According to the pro-choice position, ().

A. a pregnant woman cannot abort her baby if its father agrees to keep it

B. a pregnant woman has an absolute right of choice over an abortion

C. the baby’s father also has a say over its mother’s choice of abortion

D. the baby’s father has an unalienable obligation to support the baby