单词辩音3.A.stoppedB.workedC.openedD.finished为什么?怎么分浊,辅音?

单词辩音
3.A.stopped
B.worked
C.opened
D.finished
为什么?
怎么分浊,辅音?

因为A,B,D的ed前都是清辅音,ed念/t/,c的ed前是浊辅音,ed念/d/.
回答你的问题补充:辅音和元音
英语中音素分为元音音素和辅音音素两大类.其中元音音素20个,辅音音素24个.
元音：发音时声带振动,呼出的气流通过口腔时不受阻碍,这样形成的语音称作元音.元音发音响亮,口腔中气流不受阻碍,是构成音节的主要音.英语中有20个元音.
辅音：不论声带振动与否,发声时呼出的气流通过口腔或鼻腔时受到一定阻碍,这样的语音称为辅音.辅音发音不响亮,口腔中气流受到阻碍,不是构成音节的主要音.英语中有24个辅音.（有的书将[ts]、[dz]、[tr]、[dr] 也归为辅音,即有28个辅音,共48个音素.）
1.元音：
1) [I:] sea,he,see,piece,ceiling
2) [I] sit,build,miss,myth
3) [e] bed,desk,head,
4) [A] bad,land,bank,stamp
5) [B:] car,fast,class,plant,calm,aunt
6) [C] hot,want
7) [C:] door,more,sport,ball,warm,author,court,bought,caught
8) [U:] good,who,blue,soup,
9) [U] look,put,women,could
10) [Q] cup,come,blood,rough
11) [[:] girl,work,serve,nurse
12) [[] cadre,ago,forget,polite,dollar,doctor,famous,Saturday
13) [ei] cake,they,play,eight,great,
14) [ai] bike,die,neither,light,try,find,height,eye
15) [Ci] boy,oil
16) [[U] phone,cold,boat,soul,grow
17) [aU] house,town
18) [i[] dear,idea,deer,here,fierce,
19) [Z[] pear,care,there,fair
20) [u[] tour,poor
2.辅音
1) [p] pen,
2) [b] bed,comb
3) [t] tell,
4) [d ] day,played,wanted
5) [k] cold,sky,quick,school,back,accept,box
6) [g] big,go,guess,language
7) [m] man
8) [n] nine,knife,autumn
9) [N] bank,uncle,English,sing,
10) [ l ] land,world
11) [r] read,write,
12) [f] five,cough,laugh
13) [v] voice,of
14) [W] think,
15) [T] this,bathe
16) [s] sit,miss,science,case,scarf
17) [z] zoo,close
18) [F] sure,she,social,nation
19) [V] pleasure
20) [h] hot,who,hour
21) [w] wall,what,answer
22) [j] yes
23) [tF] child,teach,catch
24) [dV] joke,bridge
25) [ts] boats
26) [dz] goods
27) [tr] tree
28) [dr] dream