单项选择题

Which of the following is the best title for the passage

A．New Developments in Viral Research.
B．Exploring the Causes of Disease.
C．DNA: Nature's Building Block.
D．Understanding Viruses.

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单项选择题

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.

单项选择题

The word nature (Line 1, Para. 2) is closest in meaning to which of the following

A．Self-sufficiency.
B．Characteristics.
C．Shapes.
D．Speed.

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