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18．Usually doctors are understandably ______ about new medicines because of the uncertainty of their effects．（　　）
A．considerateB．cautiousC．logicalD．optimistic

分析 一般來說，醫(yī)生對新藥物很謹慎是可以理解的，因為藥物的作用還不確定．

解答 答案B．考查形容詞的詞義辨析．be cautious about對…小心或謹慎．considerate體貼的，周到的．logical邏輯的．optimistic積極的，樂觀的．根據句意，對藥物謹慎，故選B．

點評 考查詞義辨析的題，熟記單詞的意思，根據句意進行選擇．

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