说明理由英文

第一题选 B这道题 考察的是 非限制性定语从句。非限制性定语从句可以由as 和 which 引导，which 只能放在句中，（就事论事，可以指代前面的先行词，也可以指代前面整个一句话）as 可以句首（往往是大家都知道的事情）放在句中可以=which就事论事，也可以是 大家都知道的事情。这道题填 which 和 as 都对，都是 指代 前面 整句话的内容。Athat 不能出现在非限制定语从句中。C指代的是 人，这句话 明显是指代前面的全部内容。D不是定语从句的关系词。故错。第二题：选C记住句型即可：be about to do sth when············刚好要做········突然···············

1/ He must be from Africa, _________ can be seen from his skin. A. that B. as C. who D. what 解答：以上考察AS 引导非限制性定语从句，代替前面整句话的内容，所以答案为B 答案 句子意思：他一定是来自非洲，这一点，可以从他的皮肤可以看出来2/ I was about to go shopping ____C_____ it began to rain. A. while B. as C. when D. though 解答：以上考察 Sb +is about to do sth +when 结构用法，意思，主语某人正要做某事，就在这个时候，从句动词发生了，因此答案为C答案句子意思：我正要出去购物，这时候开始下雨了 备注：WHEN=AT THIS TIME 的用法 意思，就在这个时候，

1. He must be from Africa, _________ can be seen from his skin.答案：B. as 解释：as确实可以引导方式状语，比如I did the work as my father taught me.但是，这里是定语从句，只不过先行词不是一个名词或者代词，而是整个句子。在非限制性定语从句中，which和as可以引导定语从句修饰整个句子，注意that、where、when、why等都不行。举列子：They did rather badly in the maths exam,which was not what I had expected.句子中，“They did rather badly in the maths exam” 是我所没意料到的。还有就是 as we all know 结构：As we all know, china is a developping country.这里we all know 的内容就是“china is a developping country”这整一句话。补充一下，as引导方式状语时，从句式完整的句子，而引导定语从句时，则从句缺少成分，比如As we all know，缺少的就是know 的宾语，而宾语其实就是主句“china is a developping country”2. I was about to go shopping _________ it began to rain. 答案：C. when 解释：固定句型be about to do ……when……表示正要做某事时，突然另一件发生，这题的意思就是：当我正要去购物的时候突然下雨了。 when在此句做并列连词，类似于and then“就在这时”，引导的是并列句。它并不是从属连词以引导时间状语从句。when此种用法如果用在过去时的并列句中时，前句有三个特点，即：可能使用过去进行时，或过去完成时，或was about to do sth结构，而后句则使用一般过去时。而as是没有这种用法的（as做从属连词引导时间状语从句时，更多强调主从句动作同时进行）。如：I was sleeping when the telephone rang. 我正在睡觉，就在这时电话响了。I had waited for 3 hours when he came at last. 我已经等了3个小时了，就在这时他终于来了。I was about to leave when the door opened. 我正要离开，就在这时门开了。

1.I am careless so I lose the game. 2.Owing to my carelessness,I lose the game. 3.I lose the game due to my carelessness. 4.My loss of game results from my carelessness. 5.The reason that I lost my game is my carelessness. 6.My carelessness caused my loss of the game. 7.My loss of game is caused by my carelessness. 8.Since I am careless,I am always losing games. 9.As I am careless,I never won the game. 10.Carelessness was the main reason that I lost the game. 11.I am a very careless man that is why I am always losing the games. 12.My carelessness leads to the loss of game. 13.It is my carelessness that make me lose the game. 14 I am too careless to win the game. 15 I am not careful enough to win the game. 16 I think my carelessness was the responsible for my loss of game. 17.For my carelessness,I lost my game. 18.On the condition that I am careless,I will never win the game. 19.As long as I am careless,I cannot win the game. 20.I was careless and I lost the game. 只要平常多留意,不要拘泥用什麼方法,能灵活运用达到目的就成了

Explain to sb.重点词汇释义某人someone; somebody; a certain person; thingamy; thingumajig说明illustrate; explain; illustration; instruction原因reason; cause; account; master sheet; causation