单项选择题

What are side effects according to the passage

A．Withdrawal symptoms.
B．Overdoses.
C．Certain effects other than intended ones.
D．Sidewalk effects.
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单项选择题
The author advises parents ______.
A．to take medicines before children
B．to avoid taking drags in front of children
C．to throw away old medicines
D．to teach children about medicines
单项选择题
According to the passage, a linguistic hierarchy of power is ______.
A．a ladder of social status determined by his mastery of a certain language
B．created with the native speaker of a dominant language on the top
C．formed with the non-native speaker of a dominant language in the middle
D．all of the above
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