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54wy

请问定语从句在何种情况下可以省略which is 或that is？能否帮我总结一下？

2001，10月考题 语法

7，

South American flamingos can survive in temperatures __above the freezing point.

(A)that fewer degrees

(B)if few degrees

(C)only a few degrees

(D)when fewer degrees

答案：C

分析:这里是省略的定语从句,原句应该是that is only a few degrees,

Geysers are found near rivers and lakes, where water drains through the soil ______.

(A) surface below the deep

(B) deep below the surface

(C) the deep below surface

(D) the deep surface below

答案：B

分析：句中空格应修饰其前的soil，正确的是B，B定语后置修饰soil，它的完整形式是which is deep below the surface.

.By focusing on the interesting, __ the significant, the penny press newspapers of the 1830’s helped to change the concept of news. (A)which does not necessarily

(B)not necessarily

(C)was not necessarily

(D)nor necessarily being

答案：B

分析：这里是插入语，插入语的成分应该是非限制性定语从句，若谓语是be动词时主谓通常可省略。A非限制性定语从句，应该是which is not necessarily；C是省略主谓的从句，多了一个谓语was，D没有这种用法。答案是B，这里是省略的定语从句(省略which is)。