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(lái)說(shuō)，醫(yī)生對(duì)新藥物很謹(jǐn)慎是可以理解的，因?yàn)樗幬锏淖饔眠�不確定．

解答 答案B．考查形容詞的詞義辨析．be cautious about對(duì)…小心或謹(jǐn)慎．considerate體貼的，周到的．logical邏輯的．optimistic積極的，樂(lè)觀的．根據(jù)句意，對(duì)藥物謹(jǐn)慎，故選B．

點(diǎn)評(píng) 考查詞義辨析的題，熟記單詞的意思，根據(jù)句意進(jìn)行選擇．

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