2. 选C。由句子The use of the Internet can be an addiction like during use.可知，人们上网成瘾就跟take drug(吸毒)成瘾一样。

1. 选B。在短文的开头就述说了这些上网成瘾的人早上3、4点钟起床去上网；每天四次看E-mail；每次上网时间不少于3小时；甚至在网上聊天的时间比跟自己朋友在一起的时间还多。这些都是他们经常做的事情。故选B。

5. What is the writer trying to tell us at the end of the passage?

A. Don’t be addicted to the Internet.

B. Go to family activities more often.

C. Do things as you have planned

D. Stay with your parents as often as possible.

[答案及解析]

4. The example in the passage shows that _______.

A. Internet problems are more serious among college students

B. Internet addicts usually stay in the computer lab without sleep

C. Some of the Internet users have already been seriously addicted

D. The police often help to find those Internet addicts.

3. Why do people worry about the teens?

A. The teens are wasting too much money.

B. They used to work on the Internet.

C. The playing field of the teens will disappear.

D. More and more of the teens wil1 become addicted to the Internet.

1. What does the beginning of the passage tell us?

A. How to become an Internet addict.　　 B. What an Internet addict usually does.

C. Where to find an Internet addict.　　　 D. Why to write this passage.

2 How does the writer describe the addicts’ use of Internet?

A. It is something like keeping drugs.　　 B. It is a way of producing drugs.

C. It is like taking drugs. 　　　　　　 　D. It is terrible to imagine.

28．(3分)(1)0.1mol　　　　　 (2)0.3mol

27．(7分)(1) Cu+2H₂SO₄(浓)CuSO₄ + SO₂↑+2H₂O(2分)_K^S*5U.C#O%

(2) 蘸有品红溶液的滤纸褪色(1分)　　 滤纸变红(1分)_{￥高#考#资%源*}

(3)吸收多余的SO₂，防止污染空气。(1分)　　　 (4) A　 B (2分)

26．(8分)

28．(3分)已知：6.4克铜与适量的浓硝酸反应，当铜完全溶解后，共收集到NO和NO₂混合气体共2.24升(已折算为标准状况)。求：(1)被还原的HNO₃的物质的量；(2)参加反应的HNO₃的物质的量