43.A.on purpose B.for wood C.by chance D.at ease
42.A.designers B.purposes C.disadvantages D.advantages
41.A.possible B.impossible C.important D.necessary
40.A.effected B.affected C.attempted D.intended
39.A.luckily B.naturally C.partly D.separately
38.A.agrees with B.is considered as C.is based on D.comes up with
37.A.living trees B.small trees C.living things D.wild plants.
36.A.similar B.excellent C.strange D.different
54.A 考查单词、词组意义的区别:search for表示动作“寻找(东西)”,found表示“找到”。句子意思是:在房子的每个角落里搜索寻找。