This passage implies that the high cost of renting apartments is worried by ______.

A．Scientists engaged in theoretical research should not be blamed for ignoring the practical side of their discoveries.
B．Today few people have any notions of the meaning of science.
C．In science, it is not difficult to distinguish fact from fiction.
D．Practical-minded people can understand the meaning and objectives of pure science.

A．skill is required to produce humor
B．neither too much exaggeration nor absolute explicitness is fit for humor
C．people should perfect the art of humor just as the bubble blower does to the bubbles
D．humor should make people frantic for a while