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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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
The title below that best expresses the ideas of this passage is ______.
A．The Importance of Basic Research
B．Roentgen's Ignorance of X-rays
C．The Attraction of Applied Science
D．Basic Research vs. Applied Research
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