单项选择题

The reason for their unusual behavior remains a puzzle.（）

A．fact
B．mystery
C．statement
D．game

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单项选择题

One theory postulates that the ancient Filipinos came from India and Persia.（）

A．assumes
B．expects
C．predicts
D．considers

单项选择题

Dumped waste might contaminate water supplies.（）

A．destroy
B．decrease
C．delay
D．pollute

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