单项选择题

The author implies that bacteria were investigated earlier than viruses because

A．bacteria are easier to detect.
B．bacteria are harder to eradicate.
C．viruses are extremely poisonous.
D．viruses are found only in hot climates.
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单项选择题
The word proven (Line 4, Para. 1) is closest in meaning to which of the following
A．Shown.
B．Imagined.
C．Feared.
D．Considered.
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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