One of the effective ways to lessen environmental pollution is the reservation and protection of more swamps .

A、 vast thick corals
B、 pockets of wet land
C、 warm volcanoes
D、 millions of bees and wasps

【正确答案】 B

【答案解析】解析：名词辨析。swamp沼泽，湿地，煤层聚水洼：The swamp country is inclined to poach in winter．这片沼泽地带在冬季一踏就陷下去了。pockets of wet land小块湿地。coral珊瑚；volcano火山；bees and wasps蜜蜂和黄蜂。