______ into oceans and rivers is a serious form of pollution.

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问题 ______ into oceans and rivers is a serious form of pollution.

选项 A、Pouring sewage
B、Emptying litter
C、Throwing garbage
D、Dumping sewage

答案D

解析 用pour表“倒掉”之意时,应用pour away;empty litter倒空垃圾;throw garbage扔垃圾;dump sewage倾倒污水,排污;这里指“排污到江河海洋中”,因此D为答案。
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