单项选择题

At the meeting they discussed three different ______ to the study of mathematics.

A．approaches
B．means
C．methods
D．ways
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单项选择题
When Jane began to take swimming lessons, her main ______ was the fear of water.
A．evidence
B．crisis
C．obstacle
D．danger
单项选择题
Finding information in today's world is easy. The ______ is how you can tell if the information you get is useful or not.
A．ability
B．competition
C．challenge
D．knowledge
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