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
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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
单项选择题
The federal government ______.
A．encourages basic research
B．spends far more on applied research than on military problem
C．devotes more than 90% of its research and development funds to applied research
D．opposes the Foundations grants to basic research
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