单项选择题
The student found the novel（） It provided him with so much information about the subject.
A.enlightening B.confusing C.frustrating D.delighting
单项选择题 A baby might show fear of an unfamiliar adult,（）he is likely to smile and reach out to another infant.
单项选择题 （）with the size of the whole earth, the highest mountains do not seem high at all.
单项选择题 It is useful to science（）the earth as an object in space.
