单项选择题

The author implies that bacteria were investigated earlier than viruses because ______.

A．viruses are found only in hot climates
B．viruses are extremely poisonous
C．bacteria are harder to eradicate
D．bacteria are easier to detect
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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
单项选择题
By the nature of viruses the author refers to ______.
A．shapes
B．characteristics
C．speed
D．self-sufficiency
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