(2005年完形填空第19題)We are not aware of the usual smell of our own house, but we notice new smells when we visit someone else’s. The brain finds it best to keep smell receptors 19 for unfamiliar and emergency signals such as the smell of smoke,which might indicate the danger of fire.
19. [A] available [B] reliable [C] identifiable [D] suitable
【答案】A
【解析】本題為語義銜接題。The brain finds it best to keep smell receptorsfor unfamiliar and emergency signals “大腦會使氣味感知器……隨時接受不熟悉的和緊急的信號”。選項A. available 可達到的,可工作的;B. reliable 可靠的;C. identifiable 可辨認的;D. suitable 適合的。“大腦會使氣味感知器工作來處理隨時接受不熟悉和緊急信號”,故選available,符合句子含義。