小桦按36.题图所示的电路探究“通过导体的电流跟导体电阻的关系”。在此实验过程中，她保持电源电压不变，通过调节电阻箱先后6次改变A、B间的电阻值，测得相应的电流值如表1所示。  

实验次数	I/A	A、B间电阻值R/Ω
1	0.80	5
2	0.60	10
3	0.48	15
4	0.40	20
5	0.34	25
6	0.30	30

                                                

表1

（1）小桦分析表1中数据发现总结不出电流跟电阻的定量关系，你认为其原因是：       ；

（2）小桦认真思考后发现了自己在实验过程中的错误，并采取了正确的实验操作。你认为小桦每次改变电阻后应该采取的正确操作是：                             。（２分）

（3）正确操作实验后，小桦将得到的实验数据记录在表2中，请分析表2中的数据，你能得出什么探究结论？                                          。（２分）

表2

电流I/A	1.20	0.60	0.40	0.30	0.24	0.20
电阻R/Ω	5	10	15	20	25	30

 

完形填空 (共20小题；每小题1分，满分20分)
请认真阅读下面短文，从短文后各题所给的A、B、C、D四个选项中，选出最佳选项，并在答题卡上将该项涂黑。
Certainly dustmen prefer to be known as "Reuse Collection and Disposal Officers". You may think that this is rather    36 , and it is better to call a spade a spade. But dustmen can be as    37  as people of any other occupation, though we must     38   that their job is not a    39    one in the world. We often take dustmen for granted. Perhaps because they usually come very early in the morning, before most people are     40   .We are likely to forget their     41   .Our dustbins are    42   regularly, but we    43    stop to think about the men who do this. However, it is one of the most important jobs in the world, and when there are no dustmen to    44   the rubbish, the general    45   soon becomes aware that something is wrong. Recently, the dustmen of England went on strike for higher wages.
During the first few days it was regarded as a    46  .But when the first two weeks had passed, and the dustbins were overflowing in nearly every backyard in the country, the joke did not seem so    47   any more.    48   the strike continued, people could not    49   the hills of rubbish around their dustbins, and they looked for other places in which to    50  it. Even Leicester Square, in the heart of West End of London, was    51   high with plastic bags full of smelly rubbish. This was a（n）    52   attraction that the people of London were not at all     53   to see. Even when the strike was over, it took several weeks for the country to get cleaned up completely. Perhaps now the English people appreciate the work of    54  dustmen rather more    55   and won't take them for granted any more.

【小题1】

A．clever B．silly C．interesting D．reasonable

【小题2】

A．sensitive B．careless C．hopeful D．shy

【小题3】

A．realize B．believe C．know D．admit

【小题4】

A．necessary B．difficult C．romantic D．heavy

【小题5】

A．away B．up C．down D．in

【小题6】.

A．existence

B．presence

C．absence

D．performance

【小题7】

A．cleaned B．filled C．emptied D．burned

【小题8】

A．generally B．frequently C．sometimes D．seldom

【小题9】

A．take away B．take off C．take up D．take on

【小题10】

A．society B．citizen C．public D．community

【小题11】

A．trick B．joke C．trouble D．show

【小题12】

A．pleasing B．excited C．stupid D．funny

【小题13】

A．When B．While C．As D．Because

【小题14】

A．bear B．contain C．manage D．control

【小题15】

A．keep off B．give up C．take care of D．get rid of

【小题16】

A．crowded B．piled C．fixed D．put

【小题17】

A．business B．industrial C．tourist D．agricultural

【小题18】.

A．disappointed

B．serious

C．nervous

D．happy

【小题19】

A．its B．her C．his D．their

【小题20】

A．highly B．eagerly C．lowly D．entirely

There was a boy who was sent by his parents to a boarding school (寄宿学校).   36   being sent away, this boy was the   37   student in his class. He was at the top in every   38   always with high marks.
But the boy changed after   39   home and attending the boarding school. His grades started   40  . He hated being in a   41  . He was lonely all the time. And there were especially dark times when he   42   committing suicide (自杀). All of this was because he felt   43   and no one loved him.
His parents started   44   about the boy. But they even did not know what was   45   with him. So his dad decided to travel to the boarding school and   46   him.
They sat on the bank of the lake near the school. The father started asking him some casual questions about his classes, teachers and   47  . After some time his dad said, “Do you know, son, why I am here today?”
The boy answered back, “To   48   my grades?”
“No, no,” his dad replied. “I am here to tell you that you are the most   49   person for me. I want to see you   50  . I don’t care about grades. I care about you. I care about your happiness. YOU ARE MY LIFE.”
These words   51   the boy’s eyes to be filled with tears. He   52   his dad. They didn’t say anything to each other for a long time.
Now the boy had   53   he wanted. He knew there was someone on this earth who cared for him deeply. He   54   the world to someone. And today this young man is in college at the top of his class and no one has ever seen him   55  !

【小题1】

A．After B．Before C．When D．While

【小题2】

A．hardest B．naughtiest C．brightest D．dullest

【小题3】

A．exam B．activity C．game D．class

【小题4】

A．coming B．returning C．leaving D．reaching

【小题5】

A．rising B．increasing C．reducing D．dropping

【小题6】

A．group B．term C．company D．party

【小题7】

A．led to B．felt like C．thought back D．looked for

【小题8】

A．worthless B．careless C．concerned D．annoyed

【小题9】

A．caring B．turning C．worrying D．speaking

【小题10】

A．crazy B．true C．possible D．wrong

【小题11】

A．talk with B．listen to C．tell to D．care about

【小题12】

A．family B．friends C．study D．grades

【小题13】

A．realize B．analyze C．check D．test

【小题14】

A．outstanding B．important C．famous D．familiar

【小题15】

A．happy B．excellent C．interested D．satisfied

【小题16】

A．caused B．wanted C．encouraged D．forced

【小题17】

A．answered B．ignored C．hated D．hugged

【小题18】

A．nothing B．something C．everything D．anything

【小题19】

A．showed B．meant C．intended D．expressed

【小题20】

A．sad B．angry C．pleasant D．joyful

I will never forget the two impressive things that happened last winter. One of my classmates and I were   36  our project work late at night on my university's campus far from home.  Since there was   37  in the forecast, I had worn a winter   38  to school that day with a raincoat in my bag.
Throughout our work on the project, I could   39  that my friend was tired from a very long day working.  As we stepped outside to begin the   40  walk home, I   41  she was shivering(颤抖).  The temperature had dropped to the low thirties (Fahrenheit) and she   42  had a sweater on. I   43  offered her my warm jacket. She accepted it and asked me what I   44  wear then.  I told her I had another one and pretended that my   45  was a jacket.  She said later that she   46  the next morning and the first thing on her mind was feeling moved about my   47  of the jacket.
Coincidentally(碰巧), the next day I went to an open-air play and I was freezing   48  I didn’t expect it to be so   49 .  A person who I hardly   50  insisted that I wear his jacket.  I was   51  touched by this warm gesture.  He was so matter-of-fact(讲究实际的) about me   52  his coat, too:  he simply took it off and handed it to me telling me that I should   53  it. I used to think that this vast universe was a cold   54 .  It turns out that even when the temperature drops low, the people never   55  to warm each other's hearts.

【小题1】

A．starting B．destroying C．showing D．doing

【小题2】

A．rain B．fog C．snow D．cloud

【小题3】

A．suit B．jacket C．cap D．coat

【小题4】

A．think B．guess C．see D．check

【小题5】

A．easy B．short C．safe D．long

【小题6】

A．heard B．believed C．noticed D．expected

【小题7】

A．bravely B．nearly C．only D．usually

【小题8】

A．suddenly B．immediately C．madly D．calmly

【小题9】

A．would B．could C．should D．might

【小题10】

A．blouse B．sweater C．dress D．raincoat

【小题11】

A．ran away B．woke up C．fell ill D．got hurt

【小题12】

A．sale B．size C．color D．offer

【小题13】

A．though B．until C．since D．if

【小题14】

A．warm B．cold C．sunny D．dark

【小题15】

A．knew B．mattered C．loved D．blamed

【小题16】

A．deeply B．wrongly C．finally D．firmly

【小题17】

A．envying B．watching C．holding D．wearing

【小题18】

A．keep B．buy C．borrow D．throw

【小题19】

A．environment B．place C．wind D．situation

【小题20】

A．deny B．agree C．help D．stop