D. what 解析： 限定性定语从句考点， 先行语heat 放入从句为we can weld metals by means of heat 或we can weld metals by the heat. 先行词短语结构在从句中作方式状语，相关意思引导词，没有固定关系引导词， 随意性关系引导词用by means of which 或 by which. 答案为C
38. Heat has many effects, ______ we are familiar with through everyday experience. A. most of which B. in which C. that D. that 解析：非限定性定语从句引导词， 先行词为many effects, 放入从句为We are familiar with these effects through everyday experience. 或 we are familiar with most f these efftcts through every experience. 按第一种情况分析，先行词在从句中作宾语，相同意思引导词， 引导词只能为which; 按第二种情况分析，先行语短语结构在从句中作宾语， 相关意思引导词，没有固定关系引导词，只能用随意性关系引导词most of which. 答案为A
39. Ultra-sonic sound is ______ is inaudible to human ear. A. such as B. the same as C. which D. that 解析： be动词后的表语及其后从句考点， 此句中若为表语从句表达时，从句少主语，引导词用连接代词补位应为what， 理解时不合现实。 用such作表语，其后由as引导定语从句，用the same作表语，其后也应用as引导定语从句。 其区别在于，such as强调事物， the same as 强调其相似性。从现实角度分析，超音速的声音是人的耳朵中不见的。因此，答案为A。 此题是非职高考点。
41. Diesel engines are generally used for heavy-duty work ______ the weight and size of the engine are not important. A. which B. when C. where D. that 解析： 限定性定语从句， 先行词heavy-duty work, 放入从句为the weight and the size of the engine are not important during the work. 先行词短语结构在从句中时间状语。 引导词用固定关系引导词when或随意性关系引导词During which.
42. A magnetic field may be represented in ______ manner ______ an electric field. A. such …as B. the same … as C. such … that D. the same … which 解析: such ...as结构, 或 the same ....as结构， such as 强调事物， the same as强调相似性。 此题答案为B
43. We’ve all heard of Thomas Edison, ______ invented the electric light and many other things. A. the man who B. that C. which D. a man who 解析： 非限定性定语从句和限定性定语从句综合型考点， 非限定性定语从句先行语， Thomas Edison, 放入从句为Thomas Edison invented the electric light and many other things, 先行词在从句中作主语， 先行词指人，只能用who。 限定性定语从句，先行词为the man或a man, 放入从句时在从句中也作主语，先行词指人在从句中作主语，引导词可以用who/that. the man特指，强调只有他一个人， a man泛指，侧重于表示他只是其中之一。 别的可以不说，就世界公认观点来看，发明电灯的只有爱迪生一人，因此，案为A
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初中英语定语从句专项练习题与答案详解
