问题 问答题

一列长300m的火车,在平直的轨道上匀速行驶,半小时内通过了45km的路程,求:

(1)火车在前10min内的速度.

(2)该火车用此速度通过长为2700m的南京长江大桥,需要多长时间?

答案

(1)因为火车在平直的轨道上匀速行驶,所以火车在前10min内的速度:

v=

s
t
=
45×103m
1800s
=25m/s.

答:火车在前10min内的速度为25m/s.

(2)已知s=300m+2700m=3000m,v=25m/s.

该火车用此速度通过长为2700m的南京长江大桥,需要的时间:

t=

s
v
=
3000m
25m/s
=120s.

答:该火车用此速度通过长为2700m的南京长江大桥,需要120s.

判断题
阅读理解

(D)

The ’80s’ “important role” in the family has also meant a greater concentration and focus on the individual. And, it has made the word “me” one of the most frequently used words. Everything seems to be about “me”. This generation has a greater awareness of itself.

Some people do not seem to agree that all this is self-centred. When Cai Fuchao, Beijing’s publicity head, was asked to comment on the lack of responsibility of university students during the SARS period, his reply was: “Modern university students are ambitious, knowledgeable and have a very strong sense of responsibility to the society.”

As news analyst from sina.com, Pan Fengliang, echoed(随声附和)that, saying that blindly blaming them(for running away during the SARS outbreak) was prejudiced and unfair and not backed with evidence.

No doubt, the development of information technology has contributed its bit to broadening, or bending, the minds of the 80s generation.

Some people even call Gen’80 “the E-generation”. They get in touch with each other via email, QQ, ICQ and MSN.

While the people of the ’60s and ’70s swarmed(涌往)to Shanghai to catch Luo Dayou, Gen’80s were on the BBS saying that it was “really dumb”.

“The internet is so much more to those of the ’80s than you can imagine,” said Wu Junyong, an IT engineer who was born in 1978.

In Wu’s opinion, it’s the Internet that separates the 70s from the 80s, “Many of the’70s don’t see why those from the ’80s can spend everyday in front of a computer.”

A new weekly Magazine/163.com survey last year found that 40 percent of the 7,000 people surveyed, born in the ’80s, thought the computer was the most important article in life; more than 70 percent of their parents preferred the home.

67. Which of the following statements is true according to the passage?

A.The development of information technology contributed to the ’80s’greater awareness of itself.

B.The E-generation rushed to Shanghai to catch Luo Dayou.

C.All the ’80s can spend every day in front of a computer.

D.Not all people think that the “born in the 1980s” are selfish and irresponsible.

68. What can we infer from the passage?

A. All the ’80s have a strong sense of responsibility to the society.

B.Computers play a more important part in the life of the ’80s, who perhaps can’t live without them.

C.The ’80s generation are ambitious, knowledgeable and responsible.

D.People can’t imagine why the ’80s like internet so much.

69. The best title for this passage could be ______.

A. The self-centred generation              B. The internet generation

C. The “born in the ’80s”generation         D. The life of the ’80s

70. The purpose of this passage is to tell us _______.

A.people’s different opinions towards the ’80s generation.

B.the ’80s are the E-generation.

C.the ’80s are different from others in society.

D. the’80s have their own characteristics and we shouldn’t lose confidence in them