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

According to the passage , before microbes were discovered it was believed that some diseases were caused by ______.

A．germ-carrying insects
B．certain strains of bacteria
C．foul odors released from swamps
D．slimy creatures living near swamps

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