There ought to be less anxiety over the perceived risk of getting ca-考呗网题库移动版

单选题 There ought to be less anxiety over the perceived risk of getting cancer than __________ in the public mind today．

A．exists
B．exist
C．existing
D．existed

参考答案A

解析: A。如今存在于公众头脑中的担忧远多于人们对癌症已察觉风险的担忧。考查状语从句。此处考查比较状语从句中的省略问题，than或者as引导的比较状语从句中和主句重复的部分可以省略，所以空格后的比较状语从句其实省略了主语anxiety。

单选题 __________ is the center of our planetary system was a difficult concept to grasp in the Middle Ages．

A．It is the sun and not the earth
B．Being the sun and not the earth
C．The sun and not the earth
D．That the sun and not the earth

单选题 Hydrogen is the fundamental element of the universe __________it provides the building blocks from which the other elements are produced．

A．so that
B．but that
C．in that
D．provided that

单选题 Between 1897 and 1919 at least 29 motion pictures in which artificial beings were portrayed __________

A．had produced
B．have been produced
C．would have produced
D．had been produced