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题目：
41.Either of the plans ______equally dangerous.
A.are B.is C.has D.have 42.The police ______the murderer everywhere when he suddenly appeared in a theatre.A.is searching B.were searching for C.are searching D.was searching for 43.Your trousers ______dirty, you must have______ washed.A.is it B.are it C.are them D.is them 44.The Olympic games ______held every four ______.A.is years B.are years C.is year D.are year 45.He is the oly one of the students who______elected.A.are B.have C.has D.is 46. ______a good enough price for this bookA.Two yuans are B.Two yuan are C.Two yuans is D.Two yuan is 47.No bird and no beast ______in the lonely islandA.are seen B.is seen C.see D.sees 48.Every means ______prevent the water from______A.are used to polluting B. get used to pollutingC.is used to , polluted D.is used to ,being polluted 49.Each of the ______in the ship.A.passenger has his own room B. passengers have their own roomC.passenger have their own room D.sengers has his own room 50.What we need ______good textbooks.A.is B.are C.have D.has【答案解析】 41-45 BBCBD 46-50 DBDDB | 
