根据短文内容,从短文后的选项中选出能填入空白处的最佳的选项。选项中有两项为多余选

题型:阅读理解

问题:

根据短文内容,从短文后的选项中选出能填入空白处的最佳的选项。选项中有两项为多余选项。

Although many Chinese students say that their knowledge of English grammar is good, most would admit that their spoken English is poor. Whenever I speak to a Chinese student, they always say,“ My spoken English is poor.”  小题1:I would like to suggest that there may be some reasons for their problems with spoken English.

First, they fail to find suitable words to express themselves due to a limited vocabulary.小题2:However, you can speak with a limited vocabulary, if you choose a positive attitude. Others will follow you as long as you use the words that you know.

小题3:  Sometimes they make mistakes when they are speaking because they are shy and nervous. Yet students should remember that their goal should be FLUENCY NOT ACCURACY. Your aim in writing is to be accurate following the rules for grammar and using the right words and spelling them correctly. However, in speaking your aim is fluency. You want to get your message across, to talk to someone in English, as quickly and as well as you can, even though sometimes you may use a wrong word or tense, but it doesn't matter.小题4: 

The third reason is that not enough attention is paid to listening. You have one mouth but two ears! All that hearing is necessary for you to start speaking.

Fourth, most Chinese students are reactive rather than proactive language learners. Instead of actively seeking out opportunities to improve their spoken English they passively wait for speaking opportunities to come to them and wonder why their English always remains poor.小题5:

A.The person you are speaking to will understand you and make allowances for any mistakes he hears.

B.They may try to avoid making similar mistakes next time.

C.Obviously the better answer is to expand their vocabulary.

D.If you have this proactive outlook, then you will see English opportunities wherever you go.E. However, their spoken English does not have to remain “poor”!

F. Second, they are afraid of making mistakes.

G. The second reason lies in the reluctance of using what has just been learned.

考点:序数词
题型:阅读理解

Ⅰ.某物理课外小组想探究“带风帆的玩具小车所受的阻力与运动速度的关系”,他们进行了以下实验探究:

(1)猜想:

①f与车的速度v无关    ②f∝v      ③f∝v2

(2)探究步骤

①将带有风帆的玩具小车、己连接好电源的打点计时器和纸带按如图甲所示安装在光滑倾斜的长木板上:②接通打点计时器电源(电源频率f=50Hz),使玩具小车从静止开始加速运动,足够长的时间后关闭打点计时器;③改变长木板的倾角,重复以上实验,记录实验数据如下表所示:请你根据该小组的探究完成下列的问题:

(Ⅰ)图乙是倾角θ=10°的一条打点纸带,通过计算完成表中对应的空白项。

实验次数木板倾角θsinθ小车匀速运动时的速度v(m/s)小车匀速运动时速度的平方v2(m/s)2
10.070.600.36
210°0.18  
324°0.413.5112.32
436°0.595.0625.60
548°0.746.3440.20
660°0.87  
(Ⅱ)通过观察表中的实验数据,试写出倾角θ=60°时小车匀速运动的速度并填在表中对应的空白处。

(Ⅲ)结论:在实验误差范围内,通过对数据的观察分析,玩具小车所受的阻力与运动速度的定性关系是                                    

Ⅱ.“探究导体电阻与其影响因素的定量关系”的实验电路如图所示,a、b、c、d是四种不同的金属丝。

现有几根康铜合金丝和镍铬合金丝,其规格如下表所示。

编号材料长度(m)横截面积(mm2)
A镍铬合金0.80.8
B镍铬合金0.50.5
C镍铬合金0.30.5
D镍铬合金0.31.0
E康铜丝0.30.5
F康铜丝0.80.8
 

(1)电路图中四种金属丝a、b、c分别为上表中编号为C、B、D的金属丝,则d应选上表中的_____________(用表中编号A、B、C、D、E、F表示)。

(2) 为测量某一种电阻丝单位长度上的电阻R0,某同学利用一段带有滑动片P且粗细均匀的电阻丝AB和下列器材做实验:图为某次测量电阻丝长度和直径示意图,甲图为20等分的游标卡尺,读数为        mm;乙图为螺旋测微器,读数为      mm。

其余器材如下:

A.电流表:500mA、4Ω;

B.电阻箱R/:最大阻值99.9Ω,阻值最小变量为0.1Ω;

C.定值电阻R:阻值为1.2Ω;

D.电源:电动势为6V,内阻r=0.4Ω;

E.开关S、导线若干。

实验时采用如图所示电路(虚线框中电路未画出),滑动片P与电阻丝接触良好,且AP长记为L,其他导线电阻不计。改变电阻丝连入电路的长度L,分别测出通过电阻丝的电流值如下表:

 12345
L/m0.50000.40000.30000.20000.1000
I/A0.830.961.111.391.78
/A-11.201.040.900.720.56
根据测得的数据,该同学作出了电阻丝的图象,如图所示。

①请将实验电路图中虚线框中电路补充完整。要求:无论P滑至何处,电流表均安全,并且能尽可能准确地测出上表中的电流值。

②由图像得出该电阻丝单位长度上的电阻R0=______Ω/m。此时电阻箱R’连入电路的阻_____Ω。

题型:阅读理解

什么叫均压环?在建筑防雷设计时,对均压环的设计有什么要求?

题型:阅读理解

点燃下列混合气体可能会引起爆炸的是(  )

A.一氧化碳和氮气

B.二氧化碳和氧气

C.天然气和空气

D.氢气和天然气

题型:阅读理解

以下数据结构中不属于线性数据结构的是( )。

A.队列

B.线性表

C.二叉树

D.栈

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韶山8型电力机车传动装置小齿轮的材料是20CrMnMoA。

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