There was a time when asbestos (石棉) was considered quite desirable in the construction industry. It was extremely pliable, easily _(1)_, and rather cheap. Thus, prior to the early 1970s, it was widely used as insulation for buildings and pipes because it was fireproof and lightweight. Then, the truth about the hidden dangers of this naturally occurring material was discovered. There are good reasons why asbestos is no longer used in the building of houses, apartments, or other dwellings. Simply put, this fibrous substance isextremely harmful to people's health, especially the lungs. Exposure to asbestos is often compared to smoking. The more frequently it occurs, the _(2)_ the effects. Indeed, just as is the case with prolonged smoking, lung cancer is one possible outcome of breathing in the minute asbestos particles. Another type of cancer _(3)_ with the inhalation of this harmful material is called mesothelioma(間皮癌), which attacks the lining of the lungs and the lower digestive tract. _(4)_ another condition is asbestosis (石棉沉滯症). This is when the body reacts _(5)_ the asbestos fibers in the lungs by producing an acid. However, rather than destroying the asbestos, the acid _(6)_ scars the lungs. The symptoms of these diseases, which typically take from 15 to 40 years to manifest themselves, are coughing and a progressively worsening shortness of breath. Fortunately for today's construction workers, the _(7)_ of breathing in asbestos fibers are now well-known. Unfortunately, though, this knowledge comes too late for those who unwittingly damaged their health prior to the 1970s.
1. (A) ashamed (B) specific (C) available (D) prosperous 2. (A) even worse (B) worse (C) bad (D) worst 3. (A) associated (B) confined (C) fulfilled (D) motivated 4. (A) Far (B) Still (C) Even (D) More 5. (A) as (B) for (C) to (D) in 6. (A) intimately (B) severely (C) urgently (D) mutually 7. (A) hazards (B) illusions (C) compliments (D) boundaries
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