来源:普特英语听力 2019-04-10
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Officials in northwest Mexico say a private copper mine at the center of a pollution accident last week did not immediately alert the authorities that large quantities of toxic chemicals were spilling into a river. The authorities in the Mexican State of Sonora said the spill only came to light the next day when residents downstream noticed the river had turned orange. Water supplies to some 20,000 people have been cut off.

The military in Colombia says it's sending more troops to the eastern province of Arauca to deal with a recent wave of attacks. The announcement comes hours after a local politician was shot dead and eight soldiers were injured by an explosive device.