2001-6,13，39

richardn

6. By 1872 the United States had 70 engineering colleges,______astonishing expansion credited largely to the Morrill Act of 1862.

(A) because         (C) to which

(B) an                 (D) was

答案是B, 可是我不明白C为什么错？

13，In geometry, an ellipse may be defined as the locus of all points ________ distances from two fixed points is constant.

(A) which as the sum of

(B) of the sum which

(C) the sum of whose

(D) whose sum that the

这道题的答案是C, 我真的不明白这道题考的是哪个知识点，谁能帮我分析一下？

39,Proper city planning (provides for) the (distribution) of pubic utilities, public building, parks, and( recreation centers), and for adequate and( the inexpensive) housing.

答案是D???

希望有人能帮我分析分析?

linlin315

6. By 1872 the United States had 70 engineering colleges,______astonishing expansion credited largely to the Morrill Act of 1862.

(A) because         (C) to which

(B) an                 (D) was

答案是B, 可是我不明白C为什么错？

结构：句子，—— 名词 + 后置定语

如果选择C表明是定于从句，而——后面根本就不是一个句子。

linlin315

13，In geometry, an ellipse may be defined as the locus of all points ________ distances from two fixed points is constant.

(A) which as the sum of

(B) of the sum which

(C) the sum of whose

(D) whose sum that the

这道题的答案是C, 我真的不明白这道题考的是哪个知识点，谁能帮我分析一下？

可以先排除一下：A如果是对的，那么句子的结构就变成了，句子+定于从句，从句中的主语是which，which指代前面的points所以定语从句中的谓语应该用复数形式are而原句用了is。

B错在the sum which不知道在说些什么

D又是whose又是that但是后面却只有一个谓语是不可能的，因为whose和that都是要接完整的句子，也就是说应该是两个谓语动词。

说一下正确答案C

In geometry, an ellipse may be defined as the locus of all points the sum of whose distances from two fixed points is constan

whose指代all points,而the sum做从句的主语，谓语是is

这句话的意思是：在几何里，一个椭圆被定义成所有点的集合，这些点到两个固定点的距离和是一个常量。

linlin315

39,Proper city planning (provides for) the (distribution) of pubic utilities, public building, parks, and( recreation centers), and for adequate and( the inexpensive) housing.

the inexpensive-->inexpensive

for adequate and inexpensive housing表示足够而又不贵的房屋。

richardn

太感谢了！

richardn

太感谢了！