单项选择题

The emergence of the mass media and of specialized periodicals showed that ______.

A．standards of literacy had declined
B．readers' interests had diversified
C．printing techniques had improved
D．educationalists' attitudes had changed
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单项选择题
Which of the following statement is NOT mentioned in the passage
A．Aspirin has side effects on the stomach.
B．Aspirin can reduce fever.
C．The inventor of Aspirin lived in Greece.
D．One can use Aspirin to kill himsel
单项选择题
The passage focuses on ______.
A．dinosaur's geographical location
B．shifting views of dinosaurs
C．migration patterns of dinosaurs
D．geologic activity of Earth
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