单项选择题

It is very difficult for a child to adhere to rules.

A. follow
B. remember
C. understand
D. learn
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单项选择题
One theory postulates that the ancient Filipinos came from India and Persia.
A. expects
B. assumes
C. predicts
D. considers
单项选择题
Dumped waste might contaminate water supplies.
A. destroy
B. decrease
C. pollute
D. delay
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