单项选择题

What's the appropriate title for the passage

A．New Development in Viral Research
B．Understanding Viruses
C．Exploring the Causes of Disease
D．DNA: Nature's Building Block
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单项选择题
By the nature of viruses the author refers to ______.
A．shapes
B．characteristics
C．speed
D．self-sufficiency
单项选择题
Basic research is vital because ______.
A．it leads to results that can be appreciated
B．it provides the basis for scientific progress
C．it is driven out by applied research
D．its results cannot be anticipated
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