1.we had quite many difficulties with our big-size classes,___how teachers can effectively help individual students is not the least.A of which B including C besides D beyond选A,告诉我原因和翻译为什么其他选项错了?2.Mr.barren doesn't

1.we had quite many difficulties with our big-size classes,___how teachers can effectively help individual students is not the least.A of which B including C besides D beyond选A,告诉我原因和翻译为什么其他选项错了?2.Mr.barren doesn't
1.we had quite many difficulties with our big-size classes,___how teachers can effectively help individual students is not the least.
A of which B including C besides D beyond
选A,告诉我原因和翻译为什么其他选项错了?
2.Mr.barren doesn't think that all bad language should be allowed.In his opinion,there are ___that should be kept up.
A degrees B levels C limits D standards
选D,告诉我原因和翻译为什么其他选项错了?
3.____he will leave for Beijing.
A it will not be long before B it is before long that
C it is before long since D it was before long when
选B,告诉我原因和翻译为什么其他选项错了?
4.The Wenchuan earthquake and the disaster___caused have become a big concern all over the world.
A what B which C it D /
选C,告诉我原因和翻译为什么其他选项错了?
5.--where is tom?
--well,he___you___here.Otherwise he would come down right now.
A didn't know ,were B hasn't known,are C doesn't know,are D hadn't known,were
选C,告诉我原因和翻译为什么其他选项错了?

1.we had quite many difficulties with our big-size classes,___how teachers can effectively help individual students is not the least.A of which B including C besides D beyond选A,告诉我原因和翻译为什么其他选项错了?2.Mr.barren doesn't
你的问题又多又复杂还没分...
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翻译：
1,我们各个班级规模很大,这给我们带来很多难题,其中最重要的一个就是,老师们如何才能有效地帮助到每一个学生.
2,Barren 先生认为并非所有的脏话都可以说.在他看来,应该有一个可以遵循的度（标准）.
3,不久之后他就将前往北京.
4,汶川大地震和它所造成的灾害在全世界都引起了广泛的关注.
5,--Tom在哪?
--嗯,他不知道你在这儿.否则他现在就应该已经下来了的.
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1,用of which是因为 not the least.
not least of =not the least of = a phrase used when you are giving an important reason for something,or an important example of something 部分的;尤其(用于陈述重要理由或举出重要例子).
后面这句话倒装了,你把它正过来看就明白了：
not the least of which is how teachers can effectively help individual students
which 引导一个从句,指代前面的difficulties.
2,根据这句话的意思选的.
3,it is before long that 从句是个固定搭配,意思是“不久以后,...”后面从句用将来时
4,the disaster it caused=the disaster which/what it caused,省略了引导词,但it不能省掉
5,世态问题.问答都是一般现在时.