单项选择题

It can be inferred from the passage that ______ is not the component of a virus.

A．plant cells
B．RNA
C．carbohydrates
D．a coat of protein
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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
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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