五、閱讀測驗(20%)
        E-waste refers to all types of electronic or electric equipment that is no longer in use and treated as trash. Anything you can imagine that uses an electric wire can be on this list, such as TVs, washing machines, cell phones, stereo systems, and computers, just to name a few. E-waste contains harmful but also valuable rare materials, and up to 60 elements from the periodic table（週期表）can be found in some electronic products. Take the computer for example. Some models of PC monitors contain cadmium（鎘）, which is bioaccumulative and toxic for humans, especially harmful to their kidneys and bones. Lighting devices within the flat screen monitors use mercury（汞）, which can damage the nervous system, kidneys, and brain. And the material used most widely inside or outside the computer is some form of plastic such as PVC. When burned or buried, these toxic plastics will release chemicals into the environment that can affect human reproductive and immune systems（生殖和免疫系統）. According to a UN survey, at least 50 million tons of e-waste are produced every year, and most e-waste is exported to developing countries such as China, India, or Nigeria, where workers recycle what they can without high-tech techniques. This is extremely harmful to the poorly protected workers and their local environment. Now the major developed countries are trying to reduce e-waste by signing treaties to ban the exporting of toxic trash, or by passing laws against dumping e-waste.
【題組】46.What’s the main idea of this passage?
(A) E-waste contains PBTs and is highly toxic.
(B) The problem of e-waste is a global challenge.
(C) E-waste is mainly exported to developing countries.
(D) Developing countries lack the technology to recycle e-waste.