题目内容
20．Never form the habit of smoking because it ______ human beings．（ ）| A． | does harm with | B． | is harmful to | C． | is harm for | D． | does harmful to |
分析 永远不要养成吸烟的习惯，因为它对人类有害．
解答 答案：B，考查短语的搭配，表示"对…有害"可以使用do harm to或者 be harmful to，故答案为B．
点评 此题考查固定搭配，在平时的学习中，对某些动词短语要多加以积累．
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In 1870，when the Prussians surrounded the city of Paris，the city was cut off from all the usual means of communication（交流）．The people（34）Cmany different ways of sending news．One way was to let go small balloons carrying mail．（35）Dof course，they only drifted（漂移）（36）Dthe wind carried them．Often they landed inside the enemy's lines．Even balloons large enough to carry a pilot could hardly be well controlled．
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