单项选择题

Mary is always ______ when she doesn't get any mail.

A．affected
B．worried
C．puzzled
D．disturbed
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单项选择题
In addition to the ______ contents displayed, you will be able to find updated information on recent events.
A．durable
B．enduring
C．permanent
D．solid
单项选择题
The concept of personal choice concerning health is important because ______.
A．personal health choices help cure most illnesses
B．it helps raise the level of our medical knowledge
C．it is essential to personal freedom in American society
D．wrong decisions could lead to poor health
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