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   學(xué)習(xí)的目的是為了使自然人過(guò)渡到社會(huì)人、使社會(huì)人更好地服務(wù)于社會(huì),由于社會(huì)時(shí)刻在發(fā)生著變化,因此,一個(gè)良好的社會(huì)人必需具備適應(yīng)社會(huì)變化的能力。讓學(xué)生懂得用現(xiàn)成的方法解決現(xiàn)成的問(wèn)題僅僅是學(xué)習(xí)的第一步,學(xué)習(xí)的更高境界是提出新問(wèn)題、提出解決問(wèn)題的新方案。因此首先必須改變那種只局限于教師給題學(xué)生做題的被動(dòng)的、封閉的意識(shí),為了使數(shù)學(xué)適應(yīng)時(shí)代的需要,我們選擇了數(shù)學(xué)開放題作為一個(gè)切入口,開放題的引入,促進(jìn)了數(shù)學(xué)教育的開放化和個(gè)性化,從發(fā)現(xiàn)問(wèn)題和解決問(wèn)題中培養(yǎng)學(xué)生的創(chuàng)新精神和實(shí)踐能力。

關(guān)于開放題目前尚無(wú)確切的定論,通常是改變命題結(jié)構(gòu),改變?cè)O(shè)問(wèn)方式,增強(qiáng)問(wèn)題的探索性以及解決問(wèn)題過(guò)程中的多角度思考,對(duì)命題賦予新的解釋進(jìn)而形成和發(fā)現(xiàn)新的問(wèn)題。近兩年高考題中也出現(xiàn)了開放題的“影子”,如1998年第(19)題:“關(guān)于函數(shù)f(x)=4Sin(2x+π/3)(x∈R),有下列命題:①由f(x1)=f(x2)=0可得x1-x2必是π的整數(shù)倍;②y=f(x)的表達(dá)式可改寫為y=4Cos(2x-π/6):③y=f(x)的圖象關(guān)于點(diǎn)(-π/6,0)對(duì)稱;④y=f(x)的圖象關(guān)于直線x=-π/6對(duì)稱。其中正確的命題是──(注:把你認(rèn)為正確的命題的序號(hào)都填上)”顯然《高中代數(shù)》上冊(cè)第184頁(yè)例4“作函數(shù)y=3Sin(2x+π/3)的簡(jiǎn)圖!笨勺鳛槠湓汀W(xué)生如果明白這些道理就會(huì)產(chǎn)生對(duì)問(wèn)題開放的需求,逐步形成自覺(jué)的開放意識(shí)。又如2000年理19文20題  函數(shù)單調(diào)性的參數(shù)取值范圍問(wèn)題(既有條件開放又有結(jié)論的開放,條件上,對(duì),是選擇,還是選擇?選擇前者則得,以后的道路荊棘叢生,而選擇后者則有,以后的道路一片光明;結(jié)論開放體現(xiàn)在結(jié)論分為兩段,一段上可使函數(shù)單調(diào),另一段上不單調(diào),且證明不單調(diào)的方法是尋找反例);

從數(shù)學(xué)考試中引進(jìn)一定的結(jié)合現(xiàn)實(shí)背景的問(wèn)題和開放性問(wèn)題,已引起了廣大數(shù)學(xué)教育工作者的極大關(guān)注,開放題的研究已成為數(shù)學(xué)教育的一個(gè)熱點(diǎn)。

試題詳情

29.Do you expect     to be any possibility that he will be elected chairman?

  A.it            B.that           C.one          D.there

  答案  D

試題詳情

28.-When shall we meet again to discuss our vacation plan?

  -Anytime you feel like    .

  A.one           B.so           C.it           D.that

  答案  C

試題詳情

27.In our city,more and more people want to buy expensive cars,but as to me,I would like  

  less than 100,000 yuan rather than over the amount.

  A.this          B.it            C.that          D.one

  答案  D

試題詳情

26.-What an amazing film!It’s the most interesting film I’ve ever seen.

  -But I’m sure it won’t interest    .

  A.somebody        B.anybody        C.nobody         D.everybody

  答案  D

試題詳情

25.-Do you think    worthwhile to go all the way to Los Angles to buy that computer?

  -Well,I’m going to visit some relatives,too.

  A.it           B./           C.this          D.that

  答案  A

試題詳情

24.-Bob isn't feeling very well.He has caught a cold.

  -Everybody seems to have     because of the sudden change of the weather.

  A.one           B.it           C.that          D.another

  答案  A

試題詳情

23.-What do you think of the performance today?

  -Great!     But a musical genins could perform so successfully.

  A.All           B.None          C.Anybody        D.Everybody

  答案  B

試題詳情

22.No one knows exactly when our ancestors started talking,but new evidence suggests    might

  have happened a long time ago.

  A.which          B.what          C.it           D.they

  答案  C

試題詳情

21.      professional violinist practices for several hours a day,but      violinist has

his own way of playing the Beethoven concert.

  A.Each;every       B.Every;each       C.All;every       D.Either;every

  答案  B

試題詳情


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