单项选择题

What is this passage mainly about

A．Demonstrating the serious weather condition around Lake Chad.
B．Introducing people's activity around Lake Chad.
C．Analyzing of the factors that cause water decreases in Lake Chad.
D．Introducing scientists' work about water condition in Lake Chad.
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The knife is a strong piece of ______ against the defendant.
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Contrary to my expectations, the experiment ended ______ failure.
A．at
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