单项选择题

People in ancient Greece understood that______.

A．some tree bark and leaves could be used as aspirin
B．some tree bark and leaves had certain medical effects
C．aspirin was a good pain killer
D．aspirin could cure arthritis

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热门试题

单项选择题

The emergence of the mass media and of specialized periodicals indicated______.

A．the change of reader's attitudes
B．the diversity of reader's interests
C．that printing techniques had greatly improved
D．the decline of the standard of literacy

单项选择题

What is the main purpose of this passage

A．To point' out we have greatly improved our reading methods.
B．To explain how silent reading developed.
C．To illustrate the advantages of silent reading over reading aloud.
D．To criticize the mass media.