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
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Progress so far has been very good. ______ , we are sure that the project will he completed on time.
A. However
B. Otherwise
C. Therefore
D. Besides
单项选择题
Niagara Falls is a great tourist ______ , drawing millions of visitors every year.
A. attention
B. attraction
C. settlement
D. arrangement
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