52-55為題組
According to the U.S. Environmental Protection Agency (EPA), medical waste is a major source of dioxin pollution in the country. Linked to the dioxin issue is the use of PVC plastic, which is widely used in the production of blood bags, plastic tubing, and other products in hospitals and health clinics. Dioxin is an unwanted byproduct that is created when PVC is burned. Dioxin travels by air currents and settles onto grass, which is then eaten by cows and chickens in their feed. We eat polluted dairy products and meat and take the dioxin into our bodies, where it is stored in our fat for years and builds up over time. In this way, dioxin is globally distributed, and as a consequence, every member of the human population is constantly exposed to this poisonous substance. This poses special problems for childbearing women, who pass dioxin to an unborn baby or to a breastfeeding baby. In fact, the infant is the most vulnerable member of society to this chemical.
Plastics used to account for as little as 10% of medical waste in the late 1970s, before disposables began rapidly replacing reusables. They now make up as much as 30%. The EPA estimates that the average levels of dioxin in all Americans are so high that we can expect to see a variety of health effects, including cancer. Given the harm caused by the burning of medical waste, physicians and nurses have the responsibility to take a lead in reducing the use of plastics in the hospitals. After all, they can’t be treating cancer on the inside of hospitals and contributing to it on the outside.
【題組】53. Dioxin is produced _______ .
(A) when plastics are burned (B) in the making of hospital blood bags
(C) when reusables are disposed of (D) in the handling of all kinds of medical waste
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