单项选择题

Topics for conversation should be ______ to the experiences and interests of the students.

A．rigid
B．rigorous
C．remarkable
D．relevant
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单项选择题
His inability to learn foreign languages was an ______ to his career, he felt very affliction.
A．occurrence
B．obstacle
C．disturbance
D．shortage
单项选择题
The world's governments have done ______ nothing to combat the threat of nuclear accidents.
A．rarely
B．nearly
C．barely
D．intrinsically
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