单项选择题

John is ______ to pollen.

A．alert
B．allergic
C．alien
D．analogous
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单项选择题
His attempts to ______ the two friends failed bemuse they had complete faith in each other.
A．alienate
B．appreciate
C．align
D．alarm
单项选择题
The engine was ______ by a tree lying across the line.
A．degraded
B．detached
C．dismissed
D．derailed
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