中学生可以从事的娱乐和休闲活动的种类特别多,如文化知识类、技能操作类、文艺娱乐类

题型:选择题

问题:

中学生可以从事的娱乐和休闲活动的种类特别多,如文化知识类、技能操作类、文艺娱乐类、体育锻炼类等。不管从事什么娱乐和休闲活动,都必须坚持的原则是[ ]

①要节俭,不要铺张浪费

②要适合自己,有自己的特点

③要有限度,不要迷失了自我

④要健康,不要“来者不拒”

A.①②③④

B.①③④

C.②③④

D.①②③

考点:追求高雅情趣
题型:选择题

LD50与毒性评价的关系是

A.LD50值与急性毒性大小成正比

B.LD50值与急性阈剂量成反比

C.LD50值与急性毒性大小成反比

D.LD50值与染毒剂量成反比

E.LD50值与染毒剂量成正比

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阅读理解。

    Can you understand the beginning of this essay? "My smmr hols wr CWOT. B4, we used 2go2 NY 2C

my bro, his GF & 3 kds FTF."

    The Scottish teacher who received it in class had no idea what the girl who wrote it meant. The essay

was written in a form of English used in cell phones text messages (文本短信). Text messages (also called

SMS) through cell phones became very popular in the late 1990s. At first, mobile phone companies thought

that text messaging would be a good way to send messages to customers, but customers quickly began to

use the text messaging service to send messages to each other. Teenagers in particular enjoyed using text

messaging, and they began to create a new language for messages called "texting".

    A text message is limited to 160 characters, including letters, spaces, and numbers, so messages must be

kept short. In addition, typing on the small keypad of a cell phone is difficult, so it's common to make words

shorter. In texting, a single letter or number can represent a word, like "r" for "are," "u" for "you," and "2" for

"to." Several letters can also represent a phrase, like "lol" for "laughing out loud." Another characteristic of

texting is the leaving out of letters in a word, like spelling "please" as "pls."

    Some parents and teachers worry that texting will make children bad spellers and bad writers. The student

who wrote the essay at the top of this page said writing that way was more comfortable for her. (The essay

said,"My summer holidays were a complete waste of time. Before, we used to go to New York to see my

brother, his girlfriend, and their three kids face to face.")

    Not everyone agrees that texting is a bad thing. Some experts say languages always develop, and this is just

another way in which English is changing. Other people believe texting will disappear soon. New technology

for voice messages may soon make text messages a thing of the past.

1. This kind of texting is particularly popular in _____. [ ]

A. mobile phone companies

B. parents

C. customers

D. teenagers

2. Which characteristic of texting is NOT described in the passage?

[ ]

A. Using letters to represents words.

B. Using phrases to represent essay.

C. Using letters to represent phrases.

D. Using numbers to represent words.

3. Which of the following was most probably the title of students' essay? [ ]

A. My Smmr Hols

B. CU in LA

C. My GF

D. My G8 Tchr

4. Why aren't some people worried about the effect of texting? [ ]

A. Not many people use texting.

B. Spelling in English is too difficult.

C. Teenagers quickly become bored with texting.

D. Texting will disappear because of new technology.

5. Which of the following will probably be the title of the passage? [ ]

A. Texting, a way to make words shorter

B. How does texting come into being

C. Texting and different attitudes towards it

D. Main characteristics of texting

题型:选择题

鼻腔上部静脉经眼静脉汇入海绵窦。

题型:选择题

现在()显卡已经成为了个人计算机的基本配置和市场主流。

A、AGP

B、PCI

C、ISA

D、PCI-E

题型:选择题

执行政策与执行法律是一致的。( )

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