高一英语第二十单元 Mainly Revision
A. knows B. know C. had known D. known
析：⑴ A ⑵ B 句⑴、⑵都是定语从句，在“ the ( only ) one of + 复数名词 + 定语从句”结构中，先行词是 one ，而不是复数名词，故从句中谓语动词用单数。但是在“ one of + 复数名词 + 定语从句”句型中，先行词是复数名词，故从句中谓语动词用复数。
⒏ ⑴ Do you know the fact the sun is brighter than the moon ?
⑵ Do you understand the easiest fact he explained to you just now ?
A. that B. which C. the one D. as
析：⑴ A ⑵ A 句⑴是 that 引导的同位语从句， that 在从句中不作任何成分，不能省略。句 ⑵ 是 that 引导的定语从句， that 在从句中作 explain 的宾语，因先行词 fact 之前有最高级限制 easiest ，故只能用 that ，不可用 which 。
⒐ ⑴ This is the best reason he could give at the meeting .
⑵ This is the reason he didn\'t go to school this morning .
A. why B. that C. which D. because
析：⑴ B ⑵ A 。 句 ⑴ 是 that 引导的定语从句，that 在从句中作 give 的宾语，因先行词 reason 之前有 best 修饰，故只能用 that 。句 ⑵ 是 why 引导的定语从句，相当于 for which 。
【指点迷津】
是定语从句还是状语从句 ？
你在做这样一道选择题时，该选哪个答案呢？
While reading the book , we\'d better make a mark we have any question .
A. at which B. at place where C. in which D. where
你或许要选择选项 A 或 C ，因为你认为此句含有一个介词 + which 引导的定语从句，然而句中的“ mark ”在逻辑意义上并非先行词，因为我们决不是在 mark 上有任何问题，所以 A 和 C 都不是正确选项。那么选择 B 正确吗?回答是否定的，虽然选项 B 中的“place ”可以充当 where 引导的定语从句的先行词，但单数可数名词被限制性定语从句表特指的概念，“ place ”前应有 冠词“ the ”。正确选项只能是D 了，即是由 where 引导的地点状语从句，此句中的 where 等于 at the place where 。再看下列句子。
I\'d like to take the pictures where stands the ancient tower . 我想在古塔那个地方照几张像。
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Please put the chair where it was when the meeting is over . 请在会后把椅子放回原处。
Young people should go where they are badly needed . 青年人应该到最需要他们的地方去 。
以上三个句子均含有 where 引导的地点状语从句，句中的 where 可分别是由 in the place where , at the place where , to the place where 等替换。综上所述，引导地点状语从句的 where 通常可由适当的介词 + the place + 关系副词 where 替换，只要我们抓住这个关键就不难准确判断和使用 where 引导的定语从句和地点状语从句。最后再请试做下列选择题。
⒈ Many old people like to live there are many trees and flowers .
A. in which B. the place where C. in the place where D. which
⒉ This kind of bamboo grows best it is wet and warm .
A. which B. in which C. where D. the place in which
⒊ Africa is actually connected with Asia at the spot the Suez Canal was dug .
A. which B. in the place where C. the place where D. where
⒋ This is the laboratory we made the experiment the other day .
A. in the place where B. that C. which D. where
⒌ The nurse asked the children to sit they were .
A. at place where B. where C. the place where D. which
答案：1—5 CCDDB
二、学海导航
【学法指要】
单元重点词汇点拨
1 . develop 用作及物动词，有四种意思。
〖点拨〗( 1 ) 发展……，使发育。例如：
He said it was right to develop heavy industry in this city . 他说在这个城市发展重工业是合适的。
Having sports will develop your health . 运动会增进健康。
Milk will be helpful in developing a child\'s body . 牛奶对孩子身体发育有帮助。
( 2 ) 发挥，开发，启发。例如：
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