单项选择题

The 2003 survey reveals that ______.

A．hostile online attacks are still rampant
B．fighting online attacks is a never-ending battle
C．other elements than technology are at work for greater security
D．new operating systems should be updated constantly to fight viruses
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单项选择题
The best title for the passage would be ______.
A．Hypotheses and Theories
B．On Distinguishing Fact from Fiction
C．The Nature of Science and Scientists
D．Biology and the Scientific Age
单项选择题
A scientist being interested in adding to our general knowledge about oxygen would probably call his approach ______.
A．applied science
B．environmental science
C．pure science
D．agricultural science
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