What does the passage mainly tell us?

参考解析：

主旨大意题。根据第三段第二句“Because of this, the report says, e-waste is a growing problem in Lagos, Nigeria, and elsewhere in the developing world.”可知电子垃圾是发展中国家的大问题，A项错误；根据第三段第三句和第四句“Much of the waste ends up being thrown away along rivers and roads. Often it’s picked apart by poor people,”可知发展中国家没有好好利用这些电子垃圾，B项错误；C项中的environmental problems在文章并未有多少提及；根据第二段“A lot of these materials are being sent to developing nations under the excuse of reuse—to bridge the digital divide,”可知，这些电子垃圾很多都以重新利用的名义运往发展中国家。D项正确。故选D。