Questions 16 to 20 are based on the following talk. A. A sleep disease.B. A sleep disorder. C. A neurochemical. D. A nightmare.

A．Because they show more about the novel that they"re based on.
B．Because we are too close to them to see that they are reflections of current attitude.
C．Because directors are trying to get inside the minds of the 19th century people.
D．Because they are really rooted in the period they were made.

A．Contemporary pictures focus more on domestic issues.
B．These days, having one"s photograph taken is more informal.
C．In the old days, people only took pictures of their grandmothers.
D．The photographic technology is more advanced nowadays.