1.Scientists have again and again warned us that__D__certain kinds of food is dangerous,especially for children,because without a balanced diet,their bodiescannot grow properly.A.lacking of B.lack C.the lack D.a lack of2.Everybody needs something to look forward__A____.A.to to live on B.living on不是有look forward to sth/doing sth这个公式的吗？为什么不选B？3.When the boy had trouble_____his homework,he didin't know_B_____to do with it.A.with,how B.with,what我觉得要是翻中文的话，应该是“他不知道怎样去做”，但答案为什么却是选B？4.There is no doubt_B___Mr.wang is an excellent teacher.A.whether B.that这几道选择题我想知道为什么这么选，谢谢再帮忙翻译两句话1.I don't know the truth that where there is no good within,no good comes out.2.In school where I taught ten years ago English is taught.
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1 因为是泛指“任何一种”，而不是特指某种食物，所以选择a lack of,而不是the lack of。因此答案是D。2 Everyboby needs something (to look forward to) to live on。意思是“每个人都需要一些盼头继续生活下去”。括号中的to look forward to修饰前面的something，这个句子的主干是Everybody needs something to live on。这样，分析清了句子的主干以及to look forward to在句子中所做的成分，答案就出来了。所以该题答案是A。3 考点有二。一是have trouble with,这是一个固定搭配，楼主也选对了，不再多说。二是what to do (with it)，括号中的with it做状语，表示对象，后半句主干是he didn't know what to do。所以选择B是正确的。如果后半句改为he didn't know ___to finish it。这样横线处就要填how了。仔细品味一下其中的区别，你会恍然大悟的。4 There is no doubt that是个固定搭配，“毫无疑问”的意思，后接从句。所以答案是B。翻译1 我不知道（理解）“没有投入，就没有产出”的真正含义。2 十年前我任教的那所学校（现在）教授英语。希望我的回答对你有所帮助，同时希望大师们给予指点！。