请详细解答下列高一的英语单项选择,并讲出为什么选这个,其他的答案为什么不可以!新年了,

请详细解答下列高一的英语单项选择,并讲出为什么选这个,其他的答案为什么不可以!新年了,
21:The girl also learned a kind of alphabet(字母表) for the blind,in which different finger positions_______ diffeent letters of the alphabet.
A:call for B:take for C:send for D:stand for
22:Some of our otels arrange _______ entertainment which could include music ,dancing ,films,etc.
A:extra B:plenty C:probabie D:amount
23:---Excuse me,I wonder if you can help.I______ my wallet.
---But where did you lose it
A:have lost B:lost C:had lost D:lose
24:In my opinion,what a child should do,_______,is to do well in his studies.
A:after all B:above all C:in all D:over all
25:The little boy was so naughty that he _______ to be asleep when his grandpa came in.
A:protected B:prevented C:pretended D:prepared
26:He made a hole in the wall,_______ he could see what was happening outside.
A:through which B:in which C:on which D:with which
27:---Have you given the dictionary to Mary
---Not yet .I will give it to her_______I see her.
A:even though B:as soon as C:until D:unless
28:The waves were so big that their ship_______on the rock.
A:broke in B:broke away C:broke up D:broke out
29:He turned back suddenly to her________he was impatient with her slowness.
A:as if B:even if C:what if D:only if
30:The terrible earthquake did great harm ________the people in Haiti.
A:for B:with C:to D:by

21:The girl also learned a kind of alphabet(字母表) for the blind,in which different finger positions_______ diffeent letters of the alphabet.
A:call for B:take for C:send for D:stand for
D ,意思是代表；不同手指的不同位置分别代表不同的字母
22:Some of our otels arrange _______ entertainment which could include music ,dancing ,films,etc.
A:extra B:plenty C:probabie D:amount
A,额外的娱乐活动,这里用B/D缺少of,C单词不对.（这个我不是特别确定）
23:---Excuse me,I wonder if you can help.I______ my wallet.
---But where did you lose it
A:have lost B:lost C:had lost D:lose
B 这里不强调完成,只强调丢失事件的发生,所以不需要用完成时,过去时即可.
24:In my opinion,what a child should do,_______,is to do well in his studies.
A:after all B:above all C:in all D:over all
B 意思是：最重要的是；比其他的都重要的是；A毕竟 C总共 D在……之上,都不贴切；
25:The little boy was so naughty that he _______ to be asleep when his grandpa came in.
A:protected B:prevented C:pretended D:prepared
C,意思是假装；这个小男孩儿很调皮,他在爷爷进来的时候装睡；A保护 B防止 D准备,意思都不对；
26:He made a hole in the wall,_______ he could see what was happening outside.
A:through which B:in which C:on which D:with which
A 这里是定语从句,through有“通过”的意思,所以比较贴切,通股股哦小孔观察外面发生的事情；其他介词意思都不对；
27:---Have you given the dictionary to Mary
---Not yet .I will give it to her_______I see her.
A:even though B:as soon as C:until D:unless
B 意思是：一看到玛丽就给她,B词组意思是“一……就……” A即使 C直到（多用于否定）D除非,意思都不对；
28:The waves were so big that their ship_______on the rock.
A:broke in B:broke away C:broke up D:broke out
C 只有C有粉碎、破坏的意思,这里是说大船在岩石上撞毁了；
29:He turned back suddenly to her________he was impatient with her slowness.
A:as if B:even if C:what if D:only if
A＝because,因为他不满她的磨蹭,所以突然回头； B即使 C如果……怎么样 D只有；
30:The terrible earthquake did great harm ________the people in Haiti.
A:for B:with C:to D:by
C do harm to...给……造成伤害,这是固定搭配的介词.