3、主句和从句
解题要点主语从句是TOEEL常考而中国考生又较陌生英文文法结构。有关主语从句的命题几乎全部集中在structure (1-15题)中。主语从句的特点是读起来有种头重脚轻的感觉,而且有两个谓语动词。连词That引导的主语从句应特别留意。因为That在句中没有任何意义,它只具有引导出主语从句的功能,因而很容易被忽略。
全真例题分析
(1) ------- xenon could not from chemical compounds was once believed by scientists.
(A) For
(B) It was
(C) That
(D) While (91.1)
[答案] C That引导的主语从句。其中第一个谓语动词could from是从句的谓语,第二个系动was是主句的谓语。
(2) ------- to space travelers is high acceleration of deceleration forces.
(A) Danger can be
(B) They can be dangerous
(C) What can be dangerous
(D) While danger (93.1)
[答案] C what引导的主语从句。What既是从句的连词,又是从句的主语。
(3) ------- has been a topic of continual geological research.
(A) Did the continents originate
(B) How did the continents originate
(C) Have the continents originated
(D) How the continents originated (91.1)
[答案] D How引导的主语从句。
(4) ------- progress helps to relieve scarcities is a fact accepted by economists.
(A) Technological
(B) That technological
(C)Although technological
(D)There is technological
[答案] B. That引导的主语从句,当连续读到两个谓语动词(e.g. Helps...is),而空格在句首,应首先考虑主语从句。这是主语从句典型的句子结构。