图（a）是某型号电热毯的电路图，将电热丝接在u=156sin120πt V的电源
题型：实验题
问题：
图（a）是某型号电热毯的电路图，将电热丝接在u=156sin120πt V的电源上，电热毯被加热到一定温度后，由于P的作用，使输入的正弦交流电仅有半个周期能通过，如图（b）所示，从而使电热毯处于保温状态.此时交流电压表的读数是_________V.
题型：实验题
阅读理解
Reading Oliver James'Affluenza,I thought about what often happens at home.My 12-year-ole
daughter is in tears."I have so take a test tomorrow.I don't understand any of it,"she cries out.After
shouting and shutting her door,she calms down enough to go through her notes.The following dry I
ask her how the test went and the just says"OK,I got a nine".
"Wow.well done!"I say,before she finishes with "But I never get a ten!"
According to James,this obsession with getting top marks has been a bad development, which
encourages people to think of education in terms of work and money. To test this, I asked my
daughter why she was so worried about her tests. She looked at me as if I was thick. "Well, if I
don't get good grades,I won't be able to afford nice things like a car and stuff."
I was quite surprised,because I don't consider myself a pushy parent.But James suggests
and it leaves students feeling failures even if they are very bright.He points to the Danish system
(体制)of education as a better model.Creating happy citizens who have good social skills is seen
as more important than high achievements at school or the needs of business.
For me, I cannot remember the last time I had to work out the area of a circle,recite a
Shakespeare poem or grammar rules,yet I have lived a happy life.What I really needed to learn
at school was how to make polite conversations,or how to
avoid getting into debt or how to
develop good personality.
This is in fact similar to
what Oliver James really has in mind. And he is looking for schools
where students are encouraged to find and follow their own interests, something more like Tongjon.
Tongjon has been developed in some Korean private schools. It is quite different from the more
rigid system of learning things by heart that is used in Korea, and indeed in many other school
systems around the world.
As the Russian poet Pushkin said,"Inspiration(灵感)is needed in geometry(几何学)just as
much as in poetry ", and inspiration does not come from endlessly revising for tests or getting
worried about them .
1. What does the writer probably think of his/her daughter?
A. She sets herself a goal too high to reach.
B. She should be more polite to her parents.
C. Sheis hard-working but not very bright.
D. She takes her grades much too seriously.
2. What does the word "obsession"in paragraph 3 mean?
A. A plain and unavoidable fact.
B. A satisfied and very prou
d state.
C. A practical and widely-used way.
D. A fixed and often unreasonable idea.
3. What can we infer from the passage?
A. Social skills are as important as high grades.
B. Interest in grades can shake self-confidence.
C. The writer regrets not having studied hard at school.
D. Danish educational system is for very smart students.
4. The writer wants to tell us that____.
A. learning happily is the key to self-development.
B. top marks may be helpful to increase one's interest.
C. tests should be improved to give children inspiration.
D. education should meet one's needs for word and money.