問題詳情

Researchers said that old tobacco smoke does more than simply make a room smell stale. It can leave cancer-causing toxinsbehind. They found cancer-causing _48_ called tobacco-specific nitrosamines _49_ a variety of surfaces, _50_ they can get into dustor be picked up on the fingers. Children and infants are the most likely to _51_. They suggested a good clean-up could help removethese potentially harmful chemicals. The burning of tobacco releases nicotine _52_ a vapor that adsorbs strongly onto indoor surfaces.The nicotine combines with another common compound called nitrous acid to form tobacco-specific nitrosamines.
48.
(A) agents
(B) appeals
(C) stakes
(D) spears

參考答案

無參考答案

內容推薦