To define science we may simply call it ______.

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

A．is not always as pure as we suppose
B．may lead to anti-scientific, "impure" results
C．necessarily results from applied science and the discovery of a cell
D．necessarily precedes applied science, leading to the discovery of the cell