问题 单项选择题

下面关于8250的叙述中,正确的是

A.8250中接收移位寄存器的主要任务是:将并行数据转换成串行数据

B.8250中发送移位寄存器的主要任务是:将串行数据转换成并行数据

C.8250是一个通用异步接收器/发送器

D.写入8250除数寄存器的除数的计算公式为:除数=1843 200/波特率

答案

参考答案:C

解析:【解析】PC系统串口的核心是通用异步接收器/发送器。接收时,将串行数据转换成 并行数据,发送时,将并行数据转换成串行数据,所以A、B都错了。而写入8250除 数寄存器的除数计算公式应该是:除数=1843200/(波特率×16),所以D也不对。

阅读理解

The English language is changing fast,thanks to the rapid progress of technology. We all have a rapid choice: we can either bury our heads in the sand and spend the rest of our lives wishing Shakespeare were alive and well. Or we can embrace (拥抱) the new English,enter into the spirit of the Internet age called Weblish.

“You can’t avoid it,for the simple reason that whenever a new variety of language comes along,it inevitably (不可避免的) impacts(冲击)on the language as a whole.” says Dr. David Crystal, honorary professor of linguistics(语言学)at the University of Wales in Bangor, whose book Language and the Internet has just been published.

The trouble with keeping up with the new English is not so much that there are so many new words but that the old words no longer mean what we thought they did. In the past, if someone said they did not have Windows, you would have to suppose they lived in a cave.These days,it is probably because they use a Mac(which is a computer, not a rain coat). Spam is as disliked as it ever was ,but it once meant an unappetizing(引不起食欲的)canned meat.It now stands for unwanted “junk” email. Spellings are changing, too. Not only is text-messaging playing “hvc wth vrbs” (havoc(混乱)with verbs), but the conventions of email communication place little emphasis on “perfect speaking”.

Weblish loves to see nouns happily become verbs(“please bookmark this site”),and verbs become nouns (“Send me the download”). Verbs and prepositions are regularly thrown together to become new nouns or adjectives(e.g. dial-up, logon, print-on-demand, pull-down, upload), while others are created from simply pairing nouns: cyberspace, Etl, hyperlink, netspeak.

小题1:The best title of this passage would be ______.

A.Keep Up with the Latest Weblish

B.Keep Up with the Latest Development

C.Newly Invented English Words

D.Technology and English小题2:We can infer(推断)from the first paragraph that ______.

A.Some people wish Shakespeare were still alive

B.people may have different attitudes towards Weblish

C.all people welcome Weblish

D.Weblish is not popular among people小题3:The author thinks the main difficulty for people in keeping up with Weblish is that ______.

A.old words have new meanings

B.there are so many new words

C.the technology is changing too fast

D.Weblish words are full of spelling mistakes小题4:Dr. David Crystal would probably agree that ______.

A.people should not accept Weblish

B.Weblish can cause misunderstandings among people

C.Weblish will destroy the English language

D.people should know something about Weblish

多项选择题