下列关于“本质”表述正确的是（  ）

根据课文《事物的正确答案不止一个》内容填空。

____在大多数情况下，____是他们，____并非轻而易举就能获得如此非凡的灵感。____，这种非凡的灵感，____产生于这样的过程，关注极其普通、____一闪念的想法，并对它反复推敲，____充实。

        Kang kang____his friends all like animals. On Sunday.They often go to the____. Kangkang likes monkeys very much. He thinks they are so ____. Michael likes pandas because they are cute. The color of panda is black and____.Jane's favorite ____ is elephant. Elephants are kind and they have long ____. What about Maria?  She ____ tigers. They are very strong. There is a tiger show in the zoo____10 a.m in the morning. So they often have a ____ time there. When they go home, they say____to their animal friends.

____，蜡炬成灰泪始干。《无题》李商隐

电子废弃物，俗称“电子垃圾”，是指被废弃不再使用的电器或电子设备，主要包括电冰箱、空调、洗衣机、电视机等家用电器和计算机、手机等通讯电子产品的淘汰品。这些电子废弃物中，含有砷、汞、铜、铝、钗、锡、铅、镉等多种金属及其他多种持久降和生物累积性的有毒物质等。

电子废弃物已经成为新的环境公害，请阐述其危害并提出综合防治的主要措施。