A scientist being interested in adding to our general knowledge about oxygen would probably call his approach ______.

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

A．newsrooms are suffering from a decline in standards
B．there a. re too many ethical scandals going on in newspapers
C．there is a perception that newspapers should do more to correct mistakes
D．this has been a rough time for newspapers and many are wondering what is wrong