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