单项选择题

This is not an economical way to get more water; （）,it is very expensive.

A. on the other hand
B. on the contrary
C. in short
D. or else

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The London Marathon is a difficult race. ______, thousands of runners participate every year.
A. Therefore
B. Furthermore
C. Accordingly
D. Nevertheless
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I was so ______ in today’s history lesson. I didn’t understand a thing.
A. amazed
B. neglected
C. contused
D. amused
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