单项选择题

A．existed
B．discovered
C．created
D．manufactured
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单项选择题
A．overwhelmsB．surpassesC．swarmsD．washes
A．overwhelms
B．surpasses
C．swarms
D．washes
填空题
A pipe was also installed at Lake Monoun，where an outbreak of C02 killed 37 people in l984
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